JP2525604Y2 - Progressive multifocal lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a progressive multifocal lens for spectacles with a marking.

[Conventional technology]

A progressive multifocal lens having three regions, a far vision zone, a near vision zone, and a progressive zone, has a different lens design method depending on each manufacturer. Therefore, the optical layout information such as the arrangement state of the three regions, the distance power measurement position, the near power measurement position, the distribution of astigmatism, and the clear vision range may differ depending on each lens.

[Problems to be solved by the invention]

Such optical layout information becomes more diverse as the types of lenses handled increase, and it is difficult to image the optical layout information from a transparent lens. Therefore, it is very difficult to compare the optical performance with other lenses and to select the optimal lens for individual presbyopia patients with different prescriptions. Further, since the astigmatism distribution state or the average power distribution state of the lens is unknown, it is substantially impossible to simulate a substantial visual field when the lens is framed in the spectacle frame.

The present invention has been made to solve such a problem, and its purpose is to provide an astigmatism distribution state or an average power distribution state on the optical surface of a progressive multifocal lens without special efforts. Draws so that it can be read, and erases the astigmatism distribution state or the average power distribution state so that there is no adverse optical effect when information is no longer needed after the lens is framed in the spectacle frame. Is to be able to do it.

[Means for solving the problem]

In order to achieve this object, the progressive multifocal lens according to the present invention is characterized in that an astigmatism distribution state or an average power distribution state is drawn on the refractive surface of the lens by erasable ink or paint. I do.

[Action]

According to the progressive multifocal lens of the present invention, since the astigmatism distribution state or the average power distribution state is drawn on the lens refraction surface, the astigmatism distribution state or the average power distribution state of the lens is changed from the lens surface. You can see it. Furthermore, since this information is made of erasable ink or paint, it is removed after framing the spectacle frame and does not adversely affect the field of view.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Embodiment 1: FIG. 1 shows a progressive multifocal lens 1 for a right eye having an outer diameter of 75 mm according to the present embodiment as viewed from a convex surface (refracting surface) side.
Various optical layout information is paint-marked on the refraction surface of the lens 1.

2 marks the geometric center of the lens 1,
Above the geometric center 2, a horizontal line 3 and a vertical line 4 are drawn, and the intersection points indicate the distance eye point positions. The distance eye point forms a target so as to match the pupil position of the wearer in distance vision. Above this distance eye point, a distance measurement position 5 of a small circle is drawn by a broken line. The far-distance power measurement position 5 indicates a measurement site of the lens meter for measuring the refractive power of the far-sight part.

A near-distance power measurement position 6 of a small circle of 8mmφ centered on a position 12mm downward and 2.5mm to the right from this distance eye point
Are drawn by broken lines. This near power measuring position is for measuring the refractive power of the near portion, and, like the far power measuring position 5, shows the measurement site of the lens meter at the time of the near site measurement.

Reference numeral 7 denotes a geometric horizontal line for checking the horizontality of the lens 1.

The letter "R" 8 indicates the left and right of the lens,
“R” is displayed on the right eye lens and “L” is displayed on the left eye lens.

Reference numeral 9 denotes an astigmatism distribution line (1.00 diopters) in this embodiment.
Is displayed. In a progressive multifocal lens, astigmatism and image curvature are inevitable problems. Since the aberration differs depending on the design method of each lens, the degree of aberration and the aberration position differ depending on each lens type. In the present embodiment, the reason that the aberration tends to be concentrated is that
From the astigmatism distribution line 9, it can be seen that the lens 1 is obliquely below both lateral sides of the lens 1.

Further, with the astigmatism distribution line 9 of 1.00 diopter as a boundary, the sizes of three regions, a distance region, a near region, and a middle region, can be known at a glance, and the spectacle frame, the prescription of the wearer, If the astigmatism distribution line 9 is synthesized, it is possible to simulate the visual field state in the cut state of the lens after the framing, and it becomes easy to compare the optical performance with other lenses and select a lens for a presbyopic patient. In this embodiment, the reference value of the astigmatism distribution is 1.00 diopter. However, for example, a value of 0.5 diopter can be used as the clear visual field, and the reference value of the astigmatism distribution is arbitrary depending on the purpose of the layout. Can be set to

The display method of the above layout information 2 to 9 can use a solid line, a broken line, a one-dot chain line, a two-dot chain line, a surface, and the like.
Furthermore, it is also possible to display the image by applying different colors.

The paints of the layout information 2 to 9 use a pigment based on an inorganic pigment and a solvent based on an alcohol-based hydrocarbon. For example, in the case of white color (this embodiment), titanium oxide is used as a dye, and ethanol and cyclohexanone are used as solvents.

This allows the lens to be molded into the frame, and when it is no longer necessary to display the markings, it can be easily wiped and erased with a solvent such as alcohol or acetone that is commonly used for hand-wiping plastic lenses. Therefore, there is no adverse effect on the refractive power and the appearance inspection of the lens 1.

Embodiment 2: FIG. 2 is a drawing of optical layout information including the astigmatism distribution state in the same manner as in FIG. It can be seen that the distance between the power measurement positions 6 'is long, the width of the intermediate area is wide, and the near area is small.

Example 3: FIG. 3 shows the geometric center 2 ″, horizontal line 3 ″, distance power measurement position 5 ″, near power measurement position 6 ″, geometric horizontal line 7 ″, left and right display 8 ″ of the lens, The optical layout information is paint-marked in the same manner as in the first and second embodiments. In this embodiment, the addition power 11 is 250 above the lens 1 ", and the small circle 10 indicating the intersection of the horizontal line 3" and the vertical line is displayed. Line 12 is shown in the near range.
The characteristics of the substantial near vision zone can be seen at a glance from the average power distribution based on the predetermined addition power rate of the near portion. The addition rate can be set arbitrarily.

[Effect of the invention]

Since the progressive multifocal lens of the present invention has the astigmatism distribution state or the average power distribution state drawn directly on the optical surface, it is possible to compare the optical performance with other lenses, and for presbyopic patients with different prescriptions. In addition, a simulation of a substantial visual field when the lens is framed in the spectacle frame can be performed. When the drawn astigmatism distribution state or average power distribution state becomes unnecessary, it can be easily erased and does not adversely affect the lens.

[Brief description of the drawings]

1, 2, and 3 are front views of the progressive multifocal lenses of Examples 1, 2, and 3, respectively, on the convex side. 1,1 ′, 1 ″… Progressive multifocal lens, 2,2 ′, 2 ″… Geometric center, 3,3 ′… Horizontal line, 4,4 ′… Vertical line, 5,5 ′, 5 ″
… Distance power measurement position, 6,6 ′, 6 ″… Near power measurement position, 7,7 ′, 7 ″… Geometric horizontal line, 8,8 ′, 8 ″ 9, 9 ': astigmatism distribution state (astigmatism distribution line), 10: small circle indicating the intersection of a horizontal line and a vertical line, 12
…… average frequency distribution state (average frequency distribution line)

Claims (1)

(57) [Scope of request for utility model registration] 1. A progressive multifocal lens wherein an astigmatism distribution state or an average power distribution state is drawn on a refractive surface of the lens by erasable ink or paint.