CN113126325A - Spectacle frame suitable for assembling progressive multi-focus lens and lens assembling method thereof - Google Patents

Abstract

The present invention relates to a frame suitable for fitting progressive addition lenses and a lens fitting method thereof. The spectacle frame adopts specific structural parameters of a spectacle ring, a pile head and spectacle legs, and the shape characteristics of the spectacle frame are more suitable for assembling progressive multi-focus lenses, avoiding a vision fuzzy area, improving the comfort level and shortening the adaptation period; the mirror frame is provided with a mirror ring lining sheet printed with a light black assembly reference point and a measurement scale coordinate, and the assembly reference point is arranged at the intersection point of 22.5mm in the horizontal direction and 22mm in the vertical direction of the mirror ring; the measuring scale coordinates take the assembly reference point as an origin, and the scales on the horizontal and vertical axes are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point, so that the measuring scale can be used as a tool for accurately measuring the pupil distance and the pupil height, the assembly of the cut edge of the lens is facilitated, and the power, the accuracy and the wearing comfort degree of the optical lens in the test are effectively improved; and the assembly point, the distance measurement point and the near measurement point of the progressive multi-focus lens after the edge cutting can be restored by utilizing the structural parameter characteristics of the spectacle frame.

Description

Spectacle frame suitable for assembling progressive multi-focus lens and lens assembling method thereof

Technical Field

The present invention relates to a frame and a method for assembling lenses thereof, and more particularly, to a frame suitable for assembling progressive multi-focal lenses and a method for assembling lenses thereof.

Background

In the progressive addition lens fitting, the fitting of the progressive addition lens is seriously influenced by the common frame due to the unclear range and lack of pertinence of each structural parameter. The concrete aspects are as follows:

the curvature of the lens ring is over flat, the curvature of the lens ring on the market is generally lower than 300 at present, even the lens ring is made into a plane, the integral wrapping angle of the assembled lens curve and the lens frame tends to become flat, and the interference area of the nasal and temporal sides of the multifocal lenses is more exposed under the visual field, so that the wearing definition and the wearing comfort are reduced; the lens ring has larger size, more lens edge deformation areas can be reserved after the lens is mounted, and the wearing discomfort is easy to cause, which is particularly unfavorable for a multifocal lens wearer; the inner nasal and outer temporal visual field ranges below the rim of most spectacle frames are not designed in a targeted mode, and therefore the retention states of the effective visual field and the interference area after the edge cutting of the progressive multi-focus lens cannot be predicted.

The distance between the nose bridges of a common spectacle frame is generally 19 +/-3 mm, and for middle-aged and elderly people with the eyeball internal rotation capability which is increasingly weak along with the increase of age and needs to wear progressive multifocal lenses, the large distance between the nose bridges inevitably cuts off a near-reading area of the lenses, the spectacle frame is worn too tightly due to too small distance, and discomfort is caused due to too much reserved dead zones on the temporal side of the lenses; the modeling of the nose pad leaf support and the welding height position thereof are disordered, and the ductility difference is very different, so that the wearing height and the adjustment feasibility of the multifocal lenses are directly influenced; the shape, material and size of the nose pad are not defined, and most of the shapes, materials and sizes of the nose pads on the market are designed without considering the requirements of the nose bridge structure, the wearing load of glasses, comfort and stability, which is obviously insufficient for the fitting of the progressive multi-focus lens.

The width of the pile head and the whole width of the spectacle frame are not specified, so that the design of the horizontal size of the spectacle ring has no defined reasonable reference upper limit range, and even if the whole spectacle frame is worn properly, the fitting of the progressive multi-focus lens is extremely unfavorable; the pile head height, the flare and the anteversion angle are not defined, so that a wearer cannot more accurately and more easily utilize the available visual field of the progressive multi-focus lens, particularly a near-reading visual field area; meanwhile, the back vertex distance and far-corrected vision of the lens can be influenced, and discomfort such as eyelash wiping of the lens, cheek placement of the lower edge of the spectacle frame and the like can occur;

the wrapping angle is flat and even made into a plane, the wrapping angle after assembly tends to be flatter and even turned outwards, and the interference area of the nasal temporal astigmatism of the multifocal lens is more exposed under the visual field, so that the wearing definition and the comfort degree are seriously damaged;

the length and the opening width of the glasses legs are not defined, when the glasses legs are too short, the whole lens ring surface is inclined forwards, the lower edge of the lens ring is close to or even placed on the cheek part, and when the glasses legs are too long, the whole glasses frame is loosened and glided, so that the correction effect is lost, and the glasses frame is not attractive and uncomfortable; the width of the glasses legs after being completely and naturally opened is variable and has no defined range, and the glasses legs are often worn too tightly or too loosely due to proper overall width but small or large width at the ear side.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the spectacle frame suitable for assembling the progressive multi-focus lens and the lens assembling method thereof, which can effectively improve the power, the precision and the wearing comfort degree of the optical lens assembling, are beneficial to rechecking various assembling parameters of a customer after sale and convenient for edge cutting assembling

In order to realize the aim, the technical scheme of the invention is to provide a spectacle frame suitable for assembling progressive multi-focal lenses, wherein the spectacle frame is made of one of titanium metal containing more than or equal to 40% of titanium and nickel alloy containing more than or equal to 75% of nickel; the structural parameters of the spectacle frame are as follows:

the lens ring groove is of a single-circle wire structure with a 45-degree downward pointed V-shaped groove with the groove depth of 3mm, and the curvature of the lens ring is 300 bends; the maximum horizontal width L of the scope circle is 50mm, the maximum vertical height H is 36mm, the maximum distance E1 from the upper side of the nose to the lower side of the temporalis is 46mm, the maximum distance E2 from the lower side of the nose to the upper side of the temporalis is 47mm, the external flare angle beta 1 below the middle point of the line of the nose side circle is 20 degrees, and the circle below the line of the temporalis circle is blunt and adducted;

the nose bridge is connected with the left and right mirror rings, the nose bridge is welded at a position which is 26mm vertically above the inner side of the nose side ring line, and the width N of the nose bridge is 18 mm; the bracket of the nose pad is n-shaped, the rear ends of the support legs are welded and fixed at the 18mm position of the middle point of the line of the nose side ring, and the front ends are welded and dropped at the center of the upper part of the nose pad leaf box; the nose pad leaf is in a foot plate shape with a big top and a small bottom and a forward tip, is made of anti-allergic hard plastic or silica gel, is fixed in the leaf supporting box by implanting a locking block in the middle of the back, keeps a movement range of 15 degrees around, and is locked and connected with the leaf supporting box by screws;

the pile head is welded at a position 26mm vertically above a temporal side loop line, the forward inclination angle beta 2 relative to the glasses ring is 10 degrees, and the pile head is connected and locked with the glasses legs through hinge screws; the whole width L3 of the frame between the turning points of the pile heads is 138 mm; the locking ring is closed at a position 22mm vertically above the temporal side loop line;

the total length L1 of each temple is 143mm, the external opening angle beta 5 of each temple relative to the plane of the single-side lens ring is 95 degrees, the hooking angle beta 3 of each temple is 40 degrees, the internal contraction angle beta 4 of each temple is 20 degrees, and the covering angle beta 6 of the whole lens frame relative to the face is 170 degrees; the glasses legs are coated by foot sleeves made of plates, the glasses legs are perpendicular to the horizontal reference line of the glasses ring, and the maximum distance L2 between the two sides of the glasses legs after the glasses legs are completely and naturally opened is 145 mm;

the mirror bracket is provided with a mirror ring lining sheet, and light black assembly reference points and measurement scale coordinates are printed on the lining sheet; the assembly reference point is arranged at the intersection point of the horizontal direction 22.5mm and the vertical direction 22mm of the lens ring; the measuring scale coordinate takes an assembly reference point as an origin, and scales on the abscissa axis and the ordinate axis are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point.

The technical scheme of the invention also comprises a lens assembling method suitable for assembling a frame of the progressive multi-focus lens, which comprises the following steps:

(1) arranging a mirror ring lining sheet on the mirror frame, and printing light black assembly reference points and measurement scale coordinates on the lining sheet; the assembly reference point is arranged at the intersection point of the horizontal direction 22.5mm and the vertical direction 22mm of the lens ring; measuring scale coordinates by taking an assembly reference point as an origin, wherein scales on the abscissa axis and the ordinate axis are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point;

(2) the nose bridge and the pile head of the spectacle frame are respectively welded at the positions which are vertically 26mm above the inner side and the outer side of the loop nose and are positioned 4mm above the assembly reference point; the rear end of the support leg of the nose support is welded and fixed at the position 18mm from the middle point of the line of the nose side ring, is positioned 4mm below the assembly reference point and is positioned at the middle point of the vertical height of the mirror frame ring; the locking ring is closed at a position 22mm vertically above the temporal side loop line and is positioned at the same vertical height of the assembly reference point;

(3) measuring the lens wearer by using the known pupillary distance PD and the known pupillary height PH of the lens wearer or by using an assembly reference point and measurement scale coordinates, and determining an assembly point of the lens, wherein the assembly point is a coordinate point of the pupil of the lens wearer at the measurement scale coordinates, wherein the horizontal pupillary distance and the vertical pupillary height are the coordinate points; and aligning the assembling cross of the progressive multi-focus lens to an assembling point, and cutting edges to assemble the lens.

The invention provides a lens assembling method suitable for assembling a spectacle frame of a progressive multi-focus lens, which is characterized in that the assembling point is determined, and the horizontal optical center distance ND on the nose side of a single lens can be obtained by calculating according to ND = (PD-N)/2, wherein PD is the pupil distance of two eyes, and N =18mm is the width of a bridge of a spectacle frame; coordinate points of the nasal horizontal optical center distance ND and the pupil height PH in the measurement scale coordinates are taken as assembly points.

Compared with the prior art, the invention has the beneficial effects that:

1. the size of the spectacle frame provided by the invention is more suitable for the average interpupillary distance range of 62 +/-2 mm of Chinese people, the shape characteristics are more suitable for the assembly of the progressive multi-focus lens, the vision fuzzy area is avoided, the comfort level is improved, the adaptation period is shortened, and the inventory number of the progressive multi-focus lens adapted spectacle frame is obviously reduced.

2. The invention is provided with the mirror bracket gasket, the assembly reference point, the variable range and the mark thereof are reasonable in design, the position is clear and cannot be worn out, and the mirror bracket gasket can be used as a tool for accurately measuring the pupil height.

3. According to the design parameters provided by the invention, when the pupil distance is =63mm and the pupil height is =22mm, the progressive multi-focus lens assembly cross is aligned to the assembly reference point, and the assembly can be carried out without displacing the optical center of the progressive multi-focus assembly cross or the single-focus lens; when the pupil distance is not equal to 63mm and the pupil height is not equal to 22mm, the horizontal optical center distance and the vertical pupil height of the nose side of the single lens are calculated, and the progressive multi-focus lens assembly cross or the optical center of the single-focus lens is aligned to the corresponding point of the pupil point in the measurement scale coordinate, so that the lens can be easily assembled.

4. The spectacle frame provided by the invention is convenient for confirming the pupil height, the pupil distance, the variable range and assembling the progressive multi-focus lens, avoids a fuzzy blind area below the temporal side of the nose of the progressive multi-focus lens as much as possible, improves the wearing adaptability and comfort of the progressive multi-focus lens and plays the function of the progressive multi-focus lens to a greater extent; the progressive multi-focus lens assembly point, the distance measurement point and the near measurement point after the edge is cut can be restored by means of the structural parameter characteristics of the spectacle frame, and after-sale service which is untimely in wearing is provided for customers.

Drawings

Fig. 1, 2 and 3 are schematic front, side and top views of a frame for mounting a progressive addition lens according to an embodiment of the present invention;

fig. 4 is an illustration of frame patch markings of a frame provided by an embodiment of the present invention;

fig. 5 is a schematic view of the fitted cross markings of a progressive addition lens;

fig. 6, 7, 8 and 9 are reference views for lens cut edge assembly provided for embodiments 1, 2, 3 and 4 of the present invention, respectively.

In the figure, 1, a pile head; 2. a locking block; 3. a trench; 4. a nose pad; 5. a bridge of the nose; 6. bending degree of the lens ring; 7. assembling reference points; 8. measuring scale coordinates; 9. a progressive multifocal lens fitting cross; 10. and (5) assembling points.

Detailed Description

The technical solution of the present invention is further described with reference to the accompanying drawings and examples.

Example 1

The present embodiment provides a frame suitable for assembling progressive multifocal lenses, and the frame material is titanium metal containing titanium not less than 80%.

Referring to fig. 1, 2 and 3, there are respectively schematic front, side and top views of a frame for assembling a progressive addition lens according to the present embodiment; the concrete structure is as follows:

the lens ring groove 3 is of a single-circle wire structure with a 45-degree downward pointed V-shaped groove with the groove depth of 3mm, and the curvature 6 of the lens ring is 300-turn; the maximum horizontal width L of the scope circle is 50mm, the maximum vertical height H is 36mm, the maximum distance E1 from the upper side of the nose to the lower side of the temporalis is 46mm, the maximum distance E2 from the lower side of the nose to the upper side of the temporalis is 47mm, the external flare angle beta 1 below the middle point of the line of the nose side circle is 20 degrees, and the circle below the line of the temporalis circle is blunt and adducted;

the nose bridge 5 is connected with the left and right mirror rings, the nose bridge is welded at a position which is 26mm vertically above the inner side of the nose side ring line, and the width N of the nose bridge is 18 mm; the bracket of the nose support 4 is n-shaped, the rear ends of the support legs are welded and fixed at the 18mm position of the middle point of the nose side ring line, and the front ends are welded and dropped at the center of the upper part of the nose support leaf box; the nose pad leaf is in a shape of a foot plate with a large upper part and a small lower part and a forward tip, is made of anti-allergic hard plastic or silica gel material, is fixed in the leaf supporting box and keeps a movement range of 15 degrees at the periphery, and is locked and connected with the leaf supporting box through screws;

the pile head 1 is welded at a position 26mm vertically above a temporal side loop line, the forward inclination angle beta 2 relative to the mirror loop is 10 degrees, and the pile head is connected and locked with the mirror legs through hinge screws; the whole width L3 of the frame between the turning points of the pile heads is 138 mm; the locking ring 2 is closed 22mm above the line of the temporal side ring;

the total length L1 of each temple is 143mm, the external opening angle beta 5 of each temple relative to the plane of the single-side lens ring is 95 degrees, the hooking angle beta 3 of each temple is 40 degrees, the internal contraction angle beta 4 of each temple is 20 degrees, and the covering angle beta 6 of the whole lens frame relative to the face is 170 degrees; the temples are perpendicular to the horizontal reference line of the lens ring, and the maximum distance L2 between the temples on the two sides after the temples are completely and naturally opened is 145 mm.

The spectacle frame provided by the embodiment is provided with a spectacle ring lining, and is a marked schematic diagram of a spectacle frame lining of the spectacle frame provided by the embodiment with reference to fig. 4; a light black assembly reference point 7 and a measurement scale coordinate 8 are printed on the liner; the assembly reference point is arranged at the intersection point of the horizontal direction 22.5mm and the vertical direction 22mm of the lens ring; the measuring scale coordinate takes the assembly reference point as an origin, and scales on the abscissa and the ordinate are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point.

Referring to fig. 5, a schematic diagram of a fitting cross mark of a progressive addition lens, the progressive addition lens fitting cross mark 9 is shown; the spectacle frame provided by the embodiment is used for assembling the progressive addition lens, the wearer is measured according to the known binocular pupillary distance PD and the known monocular pupil height PH of the wearer or according to the assembling reference point 7 and the measuring scale coordinate 8, the coordinate point of the horizontal pupil distance and the vertical pupil height of the wearer at the measuring scale coordinate 8 is determined as the assembling point 10, the assembling cross of the progressive addition lens is aligned to the assembling point 10, and the lens is assembled by cutting.

Determining an assembly point 10, and calculating a nasal side horizontal optical center distance ND of the single lens according to (PD-N)/2, wherein PD is a pupil distance of two eyes, and N =18mm is the width of a bridge nose of the spectacle frame; the coordinate position in the measurement scale coordinate 8 is obtained with the nasal horizontal optical center distance ND and the pupil height PH.

In this embodiment, a wearer wears the spectacle frame provided in this embodiment, and if the pupillary distance =63mm and the pupillary height =22mm are provided by the wearer, the spectacle frame can be used for determining and measuring the coordinates of the pupils, and the specific method is as follows: properly adjusting the position of a nose pad of the spectacle frame to ensure comfortable wearing and stable position, and enabling an optometrist to be opposite to the front of a wearer to respectively observe pupil points of left and right eyes of the wearer; referring to fig. 6, which is an observation result of the wearer of the present embodiment, by observing the relative positional relationship between the pupillary sites (centers of the circles of the corneal range in the figure) of the left and right eyes of the wearer and the fitting reference point 7 and the measurement scale coordinates 8, it is confirmed that the wearer of the present embodiment has a pupillary distance =63mm and a pupillary height =22mm, and the pupillary height site thereof is exactly coincident with the fitting reference point 7, that is, (PD-N)/2 = (63-18)/2 =22.5mm, that is, coincident with the fitting point 10, as shown in fig. 6. And aligning the optical center of the lens with the cutting edge of the assembly point 10 (which is overlapped with the assembly reference point 7) for assembly.

Example 2

By adopting the lens bracket provided by the embodiment 1 of the invention, the lining is provided with an assembly reference point 7 and a measurement scale coordinate 8; the assembly reference point is arranged at the intersection point of the horizontal direction 22.5mm and the vertical direction 22mm of the lens ring; the measuring scale coordinate takes the assembly reference point as an original point, and the scales on the abscissa axis and the ordinate axis are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point and can be used as reference for cutting edges of the lens. If the pupillary distance and height of the wearer are unknown, the measurement can be performed by using the measurement scale coordinates 8 by means of marks on the lining of the spectacle frame.

The spectacle frame provided by the embodiment 1 is worn by a wearer, the positions of the nose pads are properly adjusted, after the wearing comfort and the position stability are ensured, an optometrist is opposite to the front of the wearer, the relative position relations between the pupil points (the centers of the cornea range circles) of the left eye and the right eye of the wearer, the assembly reference point 7 and the measurement scale coordinate 8 are respectively observed, the horizontal optical center distance of the nose side of the single lens is 20.5mm, and the pupil is located at 2mm on the measurement scale coordinate. Calculated as (PD-N)/2, the width N of the nasal bridge is 18mm, (PD-18)/2 =20.5mm, the interpupillary distance PD =59mm, the pupil height =22+2=24 mm; by adopting the spectacle frame provided by the embodiment 1 of the invention, the pupillary distance of a wearer can be measured to be 59mm and the pupil height can be measured to be 24mm by the measuring scale coordinates arranged on the inner lining of the spectacle ring.

Referring to fig. 7, which is an assembly schematic diagram of the spectacle frame provided by the present embodiment for assembling the monofocal lens, the assembling point 10 is assembled by taking the assembling reference point 7 (22.5, 22) as an initial point, displacing the horizontal interpupillary distance by 2mm toward the nasal side and displacing the pupil height by 2mm upward, and aligning the optical center of the monofocal lens with the cut edge of the assembling point 10.

Example 3

The spectacle frame provided by the embodiment 1 of the invention can assist in measuring the coordinate of the pupil, and is suitable for measuring-free pupil height assembly of a progressive multifocal lens.

When a wearer wears the spectacle frame provided by the embodiment 1 of the invention, after the position of the nose pad is properly adjusted and the wearing comfort and the position stability are ensured, an optometrist is opposite to the front of the wearer, and the relative position relations between the left eye pupil position point and the right eye pupil position point of the wearer, the assembly reference point and the measurement scale coordinate are respectively observed, so that the horizontal optical center distance of the nasal side of the single lens is 20.5mm, and the pupil is 1mm below the measurement scale coordinate. Calculated as (PD-N)/2, (PD-18)/2 =25mm, the PD is 68mm, and the pupil height is 21mm, namely, the interpupillary distance of the lens wearer is 68mm and the pupil height is 21mm in the embodiment.

Referring to fig. 8, which is an assembly schematic diagram of the frame for assembling a progressive addition lens provided by the present embodiment, the assembly point 10 is configured by taking the assembly reference point (22.5, 22) as a starting point, displacing the horizontal interpupillary distance by 2.5mm towards the temporal side, displacing the pupil height by 1mm downwards, and aligning the assembly cross of the progressive addition lens with the cut edge of the assembly point 10 for assembly.

Example 4

In this embodiment, if the wearer wears the eyeglass frame and the progressive addition lens provided in embodiment 1 of the present invention, the wearer needs to make a pair of similar eyeglasses because of the good wearing comfort, but only provides the original eyeglasses as the basis for fitting the eyeglasses.

The present embodiment provides a method for reviewing the cut edge parameters of a progressive addition lens, so as to meet the requirements of a customer. The specific method comprises the following steps:

in the first step, the parameters of the old lens cutting edge are restored.

Confirming that the assembly cross of the original lens is 3mm above the geometric center of the lens, two invisible horizontal reference imprinting circles of the lens are symmetrically distributed at 17mm positions on two sides of the geometric center, connecting lines of the two imprinting circles of a single lens (namely the horizontal reference lines of the progressive multi-focus lens) are known to be positioned at the height of 18mm in the vertical direction of the lens circle, the height of the middle point of the lens circle is consistent with the height of a nose pad welding point and the middle point of the vertical height of the lens circle, the middle point is positioned at the position 4mm below the assembly reference point of the lens frame provided by the embodiment, and the pupil height is 21 mm; the far diopter of the progressive multi-focus lens is R: -2.00DS, L: -2.00DS and ADD is +2.00DS, the horizontal distance between the far measuring points (the center of the far measuring circle and positioned right above the vertical direction of the assembly cross) of the left lens and the right lens is 68mm, the far measuring points and the geometric center of the single lens are positioned 3mm below the assembly cross, namely pupil coordinates and are 25mm away from the inner side of the midline of the bridge of the nose, namely the horizontal optical center distance of the nose side of the single lens.

And secondly, manufacturing a pair of glasses again according to the original parameters of the glasses.

The wearer is given a frame of the same style but different color, and the pupil coordinates are confirmed using the method of example 1 as follows: pupil distance =68mm, pupil height =21 mm; the wearer is given a progressive addition lens designed as the original lens, see fig. 9, and the fitting cross 9 of the new lens is cut and fitted to the pupil coordinate, i.e. fitting point 10.

And thirdly, checking the parameters of the new mirror and the original mirror.

Respectively connecting two imprinting circles of a single lens of a new lens and an original lens (namely a horizontal reference line of the progressive multi-focus lens), and knowing that the two imprinting circles are positioned at the height of 18mm in the vertical direction of the lens circle, are consistent with the middle points of the height of a welding point of a nose pad and the vertical height of the lens circle and are positioned at the position 4mm below an assembly reference point of the spectacle frame provided by the embodiment;

the measurements confirmed that the distance measurement points and the geometric centers (3 mm under the fitting cross 9, i.e. pupil coordinates) of the new and original lenses were both 25mm from the medial side of the nasal bridge midline. Therefore, the parameters of the edge cutting of the new lens are consistent with those of the original lens and meet the requirements of optometry and assembly.

If the wearer uses the ordinary glasses frame to match glasses without adopting the glasses frame provided by the embodiment, the wearer needs to meet the needs, and the wearer can bring the following inconveniences in the process of matching glasses:

1. re-selecting frames suitable for wearing and for fitting progressive addition lenses;

2. adjusting parameters of the spectacle frame to meet the wearing and assembling requirements;

3. measuring the height of the pupil by using a pupil distance ruler and an illuminating lamp tube;

4. after assembly, measuring assembly parameters one by using a measuring ruler;

5. when the lens ring imprinter and the cross-shaped position are required to be restored due to wearing discomfort, a reliable reference basis is difficult to find.

By adopting the spectacle frame and the lens assembling method provided by the embodiment, the progressive multi-focus lens assembling point, the distance measuring point and the near measuring point after edge cutting can be restored by means of the structural parameter characteristics of the spectacle frame, so that simple and accurate lens matching service is provided for customers, and meanwhile, untimely wearing help can be provided for the customers after sale.

Claims (3)

1. A frame suitable for fitting progressive addition lenses, comprising:

the spectacle frame is made of one of titanium metal containing more than or equal to 40% of titanium and nickel alloy containing more than or equal to 75% of nickel;

the lens ring groove (3) is of a single-circle wire structure with a 45-degree downward pointed V-shaped groove with the groove depth of 3mm, and the curvature (6) of the lens ring is 300-turn; the maximum horizontal width L of the scope circle is 50mm, the maximum vertical height H is 36mm, the maximum distance E1 from the upper side of the nose to the lower side of the temporalis is 46mm, the maximum distance E2 from the lower side of the nose to the upper side of the temporalis is 47mm, the external flare angle beta 1 below the middle point of the line of the nose side circle is 20 degrees, and the circle below the line of the temporalis circle is blunt and adducted;

the nose bridge (5) is connected with the left and right lens rings, the nose bridge is welded at a position which is 26mm above the inner side of the nasal side ring line vertically, and the width N of the nose bridge is 18 mm; the bracket of the nose support (4) is n-shaped, the rear ends of the support legs are welded and fixed at the position 18mm away from the middle point of the line of the nose side ring, and the front ends are welded and dropped at the center of the upper part of the nose support leaf box; the nose pad leaf is in a foot plate shape with a big top and a small bottom and a forward tip, is made of anti-allergic hard plastic or silica gel, is fixed in the leaf supporting box by implanting a locking block in the middle of the back, keeps a movement range of 15 degrees around, and is locked and connected with the leaf supporting box by screws;

the pile head (1) is welded at a position 26mm vertically above a temporal side loop line, and is 10 degrees relative to a front inclination angle beta 2 of a mirror ring, and is connected and locked with the mirror legs through hinge screws; the whole width L3 of the frame between the turning points of the pile heads is 138 mm; the locking ring (2) is closed at a position 22mm above the perpendicular position of the temporal side loop line;

the total length L1 of each temple is 143mm, the external opening angle beta 5 of each temple relative to the plane of the single-side lens ring is 95 degrees, the hooking angle beta 3 of each temple is 40 degrees, the internal contraction angle beta 4 of each temple is 20 degrees, and the covering angle beta 6 of the whole lens frame relative to the face is 170 degrees; the glasses legs are vertical to the horizontal reference line of the glasses ring, and the maximum distance L2 between the two glasses legs after the glasses legs are completely and naturally opened is 145 mm;

the mirror bracket is provided with a mirror ring lining sheet, and a light black assembly reference point (7) and a measurement scale coordinate (8) are printed on the lining sheet; the assembly reference point is arranged at the intersection point of the horizontal direction 22.5mm and the vertical direction 22mm of the lens ring; the measuring scale coordinate takes the assembly reference point as an origin, and scales on the abscissa and the ordinate are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point (7).

2. A lens fitting method for fitting a frame for fitting a progressive addition lens, comprising the steps of:

(1) printing a light black assembly reference point (7) and a measurement scale coordinate (8) on a lens ring lining sheet of the lens frame; the assembly reference point (7) is arranged at the intersection point of the horizontal direction 22.5mm and the vertical direction 22mm of the lens ring; the measuring scale coordinate (7) takes an assembly reference point as an origin, and scales on the abscissa and the ordinate are within the range of +/-2.5 mm in the horizontal direction and +/-2 mm in the vertical direction of the assembly reference point;

(2) the nose bridge (5) and the pile head (1) of the spectacle frame are respectively welded at the positions which are vertically 26mm above the inner side and the outer side of the loop nose and are positioned 4mm above the assembly reference point (7); the rear end of the support leg of the nose support (4) is welded and fixed at the position 18mm from the middle point of the line of the nose side ring, is positioned 4mm below the assembly reference point (7), and is positioned at the middle point of the vertical height of the mirror frame ring; the locking ring (2) is closed 22mm above the temporal loop line vertically and is positioned at the same vertical height of the assembly reference point (7);

(3) measuring the lens wearer by using the known pupillary distance PD and the known monocular pupil height PH of the lens wearer or by using an assembly reference point (7) and a measurement scale coordinate (8), and determining an assembly point (10) of the lens, wherein the assembly point is a coordinate point of the pupil of the lens wearer at the measurement scale coordinate (8) in the horizontal pupil distance and the vertical pupil height; the fitting cross (9) of the progressive addition lens is aligned with the fitting point (10), and the lens is assembled by cutting edges.

3. A lens fitting method suitable for fitting a frame for a progressive addition lens according to claim 2, wherein: calculating according to ND = (PD-N)/2 to obtain a horizontal optical center distance ND on the nasal side of the single lens, wherein PD is the pupil distance of two eyes, and N =18mm is the width of a bridge of a nose of a spectacle frame; the coordinate position obtained at the measurement scale coordinate (8) with the horizontal optical center distance ND on the nasal side and the pupil height PH is taken as the fitting point (10).

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