CN113633254B

CN113633254B - Cornea perception instrument

Info

Publication number: CN113633254B
Application number: CN202110930865.8A
Authority: CN
Inventors: 李贵刚; 徐玲娟; 王玮
Original assignee: Tongji Medical College of Huazhong University of Science and Technology
Current assignee: Tongji Medical College of Huazhong University of Science and Technology
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2023-11-17
Anticipated expiration: 2041-08-13
Also published as: CN113633254A

Abstract

The invention discloses a cornea perception instrument, which comprises a handle sleeve and a lateral downward pressure adjusting sleeve; the handle sleeve comprises a handle and a fiber yarn sleeved in the handle; the lateral downward-pressing adjusting sleeve piece is used for moving the handle sleeve piece, so that the front end of the fiber yarn and the horizontal sight line of the patient form an included angle alpha for pressing eyes of the patient to measure, and the included angle alpha=10 degrees to 80 degrees. Compared with the prior art, the cornea perception instrument has the advantages that a doctor can judge the sensitivity of the cornea perception of a patient according to the pressure perception of the patient to the tip of the fiber, the operation consistency, the measurement accuracy and the safety are improved, and meanwhile, the possibility of false positive is reduced.

Description

Cornea perception instrument

Technical Field

The invention relates to a device for measuring the perception of the cornea.

Background

The cornea is the most sensitive part of the sensory nerve, plays an important role in perceiving danger and nourishing the corneal tissue, and slight pressure causes a blink reaction of conditional reflex. Patients with ocular sensory nerve damage disease exhibit a varying degree of decline or even disappearance of the sensitivity level of their cornea perception. The less conscious patients are more sensitive to corneal pressure, and the more conscious patients are more sensitive to corneal pressure.

The cornea perception is measured by a currently adopted Cochet Bonnet cornea perception meter, and the measurement process is as follows: the patient was gazed straight ahead with a seat and the cornea was touched vertically with a 0.11 mm diameter nylon wire until the wire was bent to the just visible curvature (approximately 5 ° deflection). A nylon thread test of up to 60 mm, e.g. no sensation, followed by a length test of 5 mm reduction, and so on, is used until the patient produces a blink reaction. The measuring principle is as follows: under the conditions of fiber silk material and size determination, the fiber silk tip reaches the same deformation state, and the longer the silk length is, the smaller the pressure on cornea is; the shorter the filament length, the greater the pressure on the cornea.

In practice, it has been found that the cocet Bonnet corneal perception meter has mainly the following problems: 1) Lack of operational consistency: the specification requires that the person to be tested feel if a 5 ° bend occurs, this angle is not easy to grasp, and the difference in measurement by different operators is large when the patient is not well fitted. 2) The fiber touches the cornea from directly in front of, there is a risk of damaging corneal epithelial cells, and thus secondary microbial infection. 3) The fiber filaments are reused with the risk of cross-infection from person to person or from eye to eye. 4) The fiber silk approaches the eyes from the front, and besides the tactile stimulus, visual interference exists, and the false positive of blink reflex is more likely to occur. 5) The measurement results are measured in terms of fiber length, and the relative values of the differences between different patients cannot be compared because of the fact that the linear correlation between the fiber length and the hardness of the fiber length does not exist, so that the degree (percentage or fraction relation) of the loss of cornea perception cannot be quantitatively judged.

Disclosure of Invention

The invention aims to provide a cornea perception instrument with good operation consistency and high safety.

In order to achieve the above object, the cornea perception instrument of the present invention comprises a handle set and a lateral pressing-down adjusting set; the handle sleeve comprises a handle and a fiber yarn sleeved in the handle; the lateral downward-pressing adjusting sleeve piece is used for moving the handle sleeve piece, so that the front end of the fiber yarn and the horizontal line of sight of the patient form an included angle alpha for pressing eyes of the patient for measurement, and the included angle alpha=10-80 degrees, preferably 20-40 degrees.

Preferably, the corneal perceptron further comprises an effective filament length adjustment mechanism for adjusting the effective filament length L of the filament extending out of the handle (i.e., the length of the free section that is bendable upon depression).

Further, the handle is provided with an effective filament length indication scale corresponding to a set percentage of normal cornea perception. In this scheme, the effective silk length indication scale is not set according to the silk length, but calibrated according to the normal cornea perception percentage, so that the cornea perception sensitivity of a patient can be indicated more intuitively.

Further, the effective filament length adjusting mechanism comprises a push button and a sliding block; a hollow cavity for accommodating fiber wires and a slide block cavity for accommodating a slide block are arranged in the handle; the upper part of the sliding block is fixedly connected with the push button, and the lower part of the sliding block is fixedly connected with the fiber yarn; the push button protrudes from an opening at one side of the handle and is used for pushing the sliding block to slide along the sliding block cavity and driving the fiber yarn to move along the hollow cavity, so that the effective yarn length L of the fiber yarn extending out of the handle is adjusted.

Further, the push button is provided with a positioning structure (the specific structure of the push button can refer to the push button positioning structure of the utility knife), so that positioning feedback is given when the push button moves to the positions corresponding to the scale marks of the effective filament length indication scale.

Further, two ends of the handle are provided with hollow cavities, and the sliding block cavity is positioned in the middle of the hollow cavities at two ends; the lower part of the sliding block is clamped in the middle of the fiber, and the fiber can be driven to move towards any end of the handle and extend out of the hollow cavity at the end to perform measurement.

Preferably, as another way of realizing the adjustment of the effective filament length L, the effective filament length adjusting mechanism comprises an adjusting rod which is slidingly connected in a chute arranged at the upper part of the handle; the fiber yarn is fixed on the handle, the end part of the fiber yarn penetrates out of the hollow cavity arranged on the adjusting rod or between the adjusting rod and the handle, and the sliding block can slide outwards from the end part of the handle, so that the effective yarn length L of the fiber yarn outside the hollow cavity is changed. In this scheme, the cellosilk is motionless, thereby adjusts the free section length of cellosilk through the regulation pole of removal and changes effective silk length L.

Further, a clamping piece is arranged on the handle, and the fiber yarns are clamped and fixed by the clamping piece. The fiber yarn can be conveniently installed and fixed by adopting the clamping piece, but other modes (such as bonding) can be adopted for fixing.

Further, an effective silk length indication scale corresponding to the set normal cornea perception percentage is arranged on the adjusting rod.

Preferably, the effective filament length L of the fiber filament extending out of the handle is a fixed value, and the handle is provided with a pressure indication sleeve for detecting and indicating the pressure applied to the front end of the fiber filament; the pressure indication kit comprises a pressure sensor arranged at the side of the fiber and a display screen for indicating the detection result of the pressure sensor; the detection result may be a detection pressure or a normal intraocular pressure percentage obtained by conversion, and the like, and is preferably a normal intraocular pressure percentage.

Preferably, the lateral downward pressure adjusting sleeve comprises a base and a telescopic rod, wherein the lower end of the telescopic rod is fixed on the base; the handle is rotatably arranged on the telescopic rod.

Further, the telescopic rod comprises a sleeve fixed on the base and a sliding rod capable of sliding up and down in the sleeve, a height adjusting scale for indicating the up-and-down height of the handle is arranged on the sliding rod, and a position locking knob for locking the up-and-down moving position of the sliding rod is arranged on the sleeve. Because the height of each grade is the same, after the height adjustment scale is arranged, the bending degree of the fiber yarn does not need to be estimated through visual inspection, so that the fixed height size can be adjusted according to the height adjustment scale to carry out accurate test.

Further, the lateral downward pressure adjusting sleeve further comprises a rotary connector; the handle is connected with the rotary connector, and the lower part of the rotary connector is hinged with the telescopic rod. The lateral downward pressure adjusting sleeve piece can be further provided with a handle locking knob so as to lock the relative position of the handle and the rotary connector. The hinge joint of the rotary connector and the telescopic rod can be further provided with an angle locking knob capable of locking the rotation angle, so that the angle (the included angle alpha) of the fiber can be conveniently locked. The telescopic rod or the rotary connector can be further provided with an angle adjusting scale for indicating the rotation angle of the handle, so that the angle (the included angle alpha) of the fiber yarn can be conveniently adjusted.

The cornea perception instrument can enable a doctor to judge the sensitivity of the cornea perception of a patient according to the pressure perception of the patient to the tip of the fiber. Compared with the vertical downward pressing mode adopted in the prior art, the invention has the beneficial effects that:

1) The handle is pushed by keeping a certain included angle with the horizontal line of sight of the patient until the tip of the fiber yarn is basically tangent with the horizontal line of sight of the patient, and whether the patient has blink reflection or not is observed. Compared with the prior art, the bending angle is larger, and the judgment of tangency is much easier than that of small-angle bending, so that the operation consistency and the measurement accuracy are improved.

2) The fiber silk touches the cornea from oblique anterior, and the side pushes down, compares with prior art, has reduced the straight front and has stabbed the risk of damaging the cornea epithelial cell, and then secondary microorganism infection.

3) The fiber approaches the eyes from the oblique front, compared with the prior art, the factors of visual disturbance are reduced, and the possibility of false positive is reduced.

4) The handle sleeve member has simple structure and low cost, can be used as a disposable replacement sleeve member to be replaced at any time, and does not have the risk of cross infection between people or eyes.

Drawings

Fig. 1 is a schematic perspective view of a cornea perception instrument according to embodiment 1 of the present invention.

Fig. 2 and 3 are schematic front view structures of the handle assembly and the lateral pressing adjustment assembly in fig. 1, respectively.

Fig. 4 is a schematic cross-sectional view (axially split in half, only a portion of which is shown) of the locking structure of the telescopic rod of fig. 3.

Fig. 5 is a schematic cross-sectional view (along the filament axis) of the handle set of fig. 2.

Fig. 6 and 7 are schematic views of the handle set at a perception level of 1 and 5, respectively.

Fig. 8 and 9 are schematic views of the state of the eye immediately after contact and depression to the lowest point when measurement is performed by using example 1.

Fig. 10 is a schematic perspective view of a cornea perception instrument according to embodiment 2 of the present invention.

Fig. 11 is a schematic cross-sectional view (along the filament axis) of the handle set of fig. 10.

Fig. 12 is a schematic perspective view of a cornea perception instrument according to embodiment 3 of the present invention.

Fig. 13 is a schematic view showing a state when the cornea appearance of fig. 12 is used for measurement.

Fig. 14 is a schematic perspective view of a handle set of a cornea perception instrument according to embodiment 4 of the present invention, and a lateral depression adjustment set is the same as that of embodiment 1.

Fig. 15 is a schematic partial cross-sectional view of the handle set of fig. 14.

Wherein:

the handle set 100, the fiber yarn 110, the handle 120, the hollow cavity 121, the slider cavity 122, the buckle 123, the pressure sensor 124, the display screen 125, the effective yarn length indication scale 126, the switch button 127, the effective yarn length adjusting mechanism 130, the push button 131, the slider 132, the adjusting rod 133 and the push handle 134;

the side down adjusting kit 200, the base 210, the telescopic rod 220, the sleeve 221, the slide bar 222, the height adjusting scale 223, the rotary connector 230, the position locking knob 240, the angle locking knob 250, the handle locking knob 260;

the patient's eye 300.

Detailed Description

The invention will now be described in further detail with reference to the drawings and to specific examples.

Example 1

As shown in fig. 1 to 7, the present embodiment provides a corneal perception instrument comprising a handle set 100 and a lateral depression adjustment set 200; the handle set 100 comprises a handle 120 and a fiber filament 110 sleeved in the handle 120; the lateral downward adjustment assembly 200 is used to move the handle assembly 100 such that the front end of the filament 110 is positioned at an angle α from the horizontal line of sight of the patient to measure the downward pressure of the patient's eye 300.

In this embodiment, the value of α is 30 °, and other suitable angles may be selected within the range of 10 ° to 80 °, such as 10 °, 20 °, 30 °, 40 °,50 °, 60 °, 70 °, 80 °, and preferably within the range of 20 ° to 40 °.

To adjust the effective filament length L (i.e., the length of the free section that is bendable when depressed) of the filament 110, the corneal perception instrument provided in this embodiment further includes an effective filament length adjustment mechanism 130 that adjusts the effective filament length L of the filament 110 extending beyond the handle 120.

To indicate the effective filament length L of the filament 110, the handle 120 is further provided with an effective filament length indication scale 126 corresponding to a set normal cornea perception percentage (indication marks corresponding to scales may be set according to actual situations, and are not specifically defined in the present invention). The effective silk indication scale 126 may be calibrated to a normal cornea perception percentage, which may indicate the patient's cornea perception sensitivity more visually than if the scale were set equidistant from the silk. In this example, the perception scores were 5 in total, each corresponding to 100%,50%,25%,12.5% and 6.25% of normal cornea perception. Or 1,1/2,1/4,1/8,1/16. The smaller the scale level number, the more sensitive the perception; the larger the number, the more severe the perception reduction. Other graduation division criteria may also be selected as desired.

As a specific structure, the effective filament length adjusting mechanism 130 includes a push button 131 and a slider 132; a hollow cavity 121 for accommodating the fiber yarn 110 and a slider cavity 122 for accommodating the slider 132 are arranged in the handle 120; the upper part of the sliding block 132 is fixedly connected with the push button 131, and the lower part is fixedly connected with the fiber yarn 110; the push button 131 protrudes from an opening at one side of the handle 120, and can push the slider 132 to slide along the slider cavity 122 and drive the fiber yarn 110 to move along the hollow cavity 121, so as to adjust the effective yarn length L of the fiber yarn 110 extending out of the handle 120.

The push button 131 is provided with a positioning structure so that positioning feedback is given when the push button moves to the positions corresponding to the scale marks of the effective wire length indication scale 126, thereby being convenient for determining whether the push button moves in place or not, and avoiding the push button from being pushed by accident. The specific structure of the push button can be a push button positioning structure of a craft knife.

As a specific structure, the lateral pressing adjustment kit 200 includes a base 210 and a telescopic rod 220, the lower end of the telescopic rod 220 being fixed to the base 210; the handle set 100 may be directly fixed to the telescopic rod 220, or may be movably connected in a rotatable manner, so as to adjust the pressing angle of the filament 110.

When the movable connection mode is adopted, the lateral downward pressure adjusting sleeve 200 further comprises a rotary connector 230 and a handle locking knob 260; the handle 120 is sleeved in the rotary connector 230 and can be locked by a handle locking knob 260; the lower part of the rotary joint 230 is hinged to the telescopic rod 220, and an angle locking knob 250 capable of locking the rotation angle is provided at the hinge. The telescopic rod 220 or the rotary joint 230 is provided with an angle adjustment scale (not shown) for indicating the rotation angle of the handle 120.

The telescopic rod 220 may have two or more telescopic structures, and when the telescopic structure is adopted, the telescopic rod 220 includes a sleeve 221 fixed on the base and a slide bar 222 capable of sliding up and down in the sleeve 221, and a position locking knob 240 for locking the up and down movement position of the slide bar 222 is provided on the sleeve 221.

The corneal perception instrument enables a doctor to judge the sensitivity of the corneal perception of a patient according to the pressure perception of the patient on the tip of the fiber yarn 110. The measuring steps are as follows:

1) The patient is in a lying position, the handle sleeve 100 is sleeved on the rotary connector 230 and is locked through the handle locking knob 260, and if necessary, the inclination angle of the handle 120 can be adjusted after the angle locking knob 250 is unlocked;

2) Placing the base 210 beside the eye to be tested and positioning the telescopic rod 220 in the vertical direction, moving the slide rod 222 up and down, positioning the handle 120 at a proper height, and locking by the position locking knob 240;

3) Pushing the push button 131 to the scale "1" to completely push out the filament 110;

4) Unlocking position locking knob 240 or handle locking knob 260, adjusting the position and height of handle 120 such that the tip of fiber 110 is positioned directly above the pupil and in contact with patient's eye 300 at angle α (relative to the patient's horizontal line of sight), see fig. 8;

5) Unlocking the position locking knob 240, slowly moving the slide bar 222 downward, so that the slide bar 222 moves in the sleeve 221 until the tip of the fiber 110 is tangential to the eyeball, and observing whether the patient has blink reflection or not, as shown in fig. 9;

6) If the patient has blink reflex, the cornea perception level of the patient is 1;

7) If the patient does not have blink reflex, the push button 131 is pushed to the scale "2" or other scales, and the steps 4) and 5) are repeated until the patient has blink response to the pressure, and the scale at this time is the cornea perception level of the patient.

8) After the test is completed, the disposable handle set 100 is removed and discarded, leaving the side-down adjustment set 200.

Example 2

As shown in fig. 10 and 11, the present embodiment is further modified based on the embodiment 1 as follows (the same points will not be described any more):

a rotary joint 230 is integrally provided at the middle of the handle 120, and is hinged to the slide bar 222 via the latter. The two ends of the handle 120 are provided with hollow cavities 121, and the slider cavity 122 is positioned in the middle of the hollow cavities 121 at the two ends; the lower part of the slider 132 is clamped in the middle of the fiber 110, and drives the fiber 110 to move to either end of the handle 120 and extend out of the hollow cavity 121 at the same end for measurement.

To indicate the perception levels on both sides, the effective filament length indication scale 126 is set to be a symmetrical scale, which is 1,2,3,4,5,4,3,2,1 in turn, and the specific scale is divided as in embodiment 1.

The embodiment can achieve the aim of detecting eyes by one wire, and the measurement steps are briefly described as follows:

1) In the initial position, the push button 131 is located in the middle of the handle 120, and both ends of the fiber are hidden inside the handle 120.

2) In preparation for detection, the handle 120 is mounted on the slide bar 222, and the height of the handle 120 is adjusted.

3) When the left end of the fiber 110 is used for detection, the handle 120 is rotated to a certain fixed angle (30 degrees for example) leftwards, the push button 131 is moved leftwards and downwards, the left end of the fiber 110 is pushed out to the measuring length, and detection is performed on the first eye.

After the detection of the left end is completed, the handle 120 is rotated rightward to the same fixed angle (30 °), and then the push button 131 is moved downward rightward until the right end of the fiber yarn 110 is pushed out, and at the same time, the fiber yarn 110 on the left side is slowly retracted into the handle 120. After the filament 110 is extended to the measured length, a second eye is inspected.

The two eyes can be detected by realizing one handle set 100 and one wire through the steps, and the risk of cross infection of the two eyes is avoided. After the test is completed, the handle set 100 is removed and discarded, leaving the side-down adjustment set 200.

Example 3

As shown in fig. 12 and 13, the present embodiment is further modified based on example 1 as follows (the same points will not be described any more):

the effective wire length adjusting mechanism 130 comprises an adjusting rod 133, and the adjusting rod 133 is slidably connected in a chute (not shown) arranged at the upper part of the handle 120; the filament 110 is fixed to the handle 120 with its end portion penetrating from the hollow cavity 121 provided on the adjustment lever 133 or between the adjustment lever 133 and the handle 120.

In this embodiment, the hollow cavity 121 is formed by combining two semicircular grooves at the lower part of the adjusting lever 133 and at the upper part of the handle 120 to form a complete circular cavity. However, the hollow cavity 121 may be completely disposed in the adjustment lever 133, and the fiber yarn 110 needs to be assembled with the adjustment lever 133 and then fixed to the handle 120.

The handle 120 is provided with a clamping piece 123, and the fiber wires 110 are clamped and fixed by the clamping piece 123. The use of the snap 123 facilitates the attachment of the filament 110, but it is not excluded that other means (e.g. adhesive) may be used for attachment. For convenience of operation, a pushing handle 134 is further provided on the adjustment lever 133.

The adjustment lever 133 may continue to slide outwardly from the end of the handle 120 to vary the effective filament length L of the filament 110 outside the hollow cavity 121.

To indicate the effective filament length L of the filament 110, the adjustment lever 133 is provided with an effective filament length indication scale 126 corresponding to a set normal cornea perception percentage.

To indicate the elevation of the slide bar, a height adjustment scale 223 is provided on the slide bar 222. Since the height of each grade is the same, after the height adjustment scale 223 is set, the bending degree of the fiber yarn 110 does not need to be estimated by visual inspection, so that a precise test can be performed by adjusting a fixed height size according to the height adjustment scale 223.

In this embodiment, the filament 110 is fixed relative to the handle by the fastening member 123, and the adjusting lever 133 is moved forward by pushing the pushing handle 134 to change the protruding length (effective filament length L) of the filament 110, thereby adjusting the perception level.

The present embodiment also has the following additional effects with respect to embodiment 1: the effective filament length L can be directly adjusted while the relative position of the filament 110 to the eyeball is unchanged, thereby eliminating the need to change the position of the lateral push-down adjustment assembly 200 or to shift the patient after changing gear.

Example 4

As shown in fig. 14 and 15, the present embodiment is further modified based on example 1 as follows (the same points will not be described any more):

the effective filament length L of the fiber filament 110 extending out of the handle 120 is a fixed value, and the handle 120 is provided with a pressure indication sleeve for detecting and indicating the pressure applied to the front end of the fiber filament 110; the pressure indication kit comprises a pressure sensor 124 arranged at the side of the fiber yarn 110, a display screen 125 for indicating the detection result of the pressure sensor 124, and a corresponding battery, a circuit, a switch button 127 and the like.

Since the pressure can be directly measured and read, the perception level does not need to be judged by the effective filament length L of the filament 110, so the filament length of the filament 110 can be set to a fixed value, the end point is not tangent any more when the filament is pressed down, but the actual position when blink reflection occurs, at this time, the perception level can be determined according to the corresponding relation between the perception level and the pressure value, and the perception level is displayed on the display screen 125.

The deformation degree of the fiber yarn 110 is monitored by the pressure sensor in the embodiment, so that the pressure of the fiber yarn 110 is converted into an electric signal, and different perception pressure levels are displayed on the display screen 125. The correspondence between the perception level and the measured pressure value may be set as desired, for example: the perception level 0 is normal, the lower the value, the more sensitive the perception; the higher the value, the weaker the perception.

Claims

1. A corneal perception instrument, characterized by: comprises a handle sleeve (100), an effective filament length adjusting mechanism (130) and a lateral downward pressure adjusting sleeve (200); the handle sleeve (100) comprises a handle (120) and a fiber wire (110) sleeved in the handle (120);

the effective filament length adjusting mechanism (130) is used for adjusting the effective filament length L of the fiber filaments (110) extending out of the handle (120);

the lateral downward pressure adjusting sleeve (200) comprises a base (210) and a telescopic rod (220); the telescopic rod (220) is arranged on the base and can drive the handle sleeve member (100) to vertically move up and down, and when the telescopic rod moves downwards, the front end of the fiber yarn (110) and the horizontal line of sight of a patient form an included angle alpha to press eyes of the patient for measurement, and the included angle alpha=10-80 degrees.

2. A corneal perceptron as defined in claim 1, wherein: the included angle alpha=20° to 40 °.

3. A corneal perceptron as defined in claim 1, wherein: the handle (120) is provided with an effective filament length indication scale (126) corresponding to a set percentage of normal cornea perception.

4. A corneal perceptron as defined in claim 3, wherein: the effective filament length adjusting mechanism (130) comprises a push button (131) and a sliding block (132); a hollow cavity (121) for accommodating the fiber yarn (110) and a slide block cavity (122) for accommodating the slide block (132) are arranged in the handle (120); the upper part of the sliding block (132) is fixedly connected with the push button (131), and the lower part of the sliding block is fixedly connected with the fiber yarn (110); the push button (131) protrudes from an opening at one side of the handle (120) and is used for pushing the sliding block (132) to slide along the sliding block cavity (122) and driving the fiber yarn (110) to move along the hollow cavity (121), so that the effective yarn length L of the fiber yarn (110) extending out of the handle (120) is adjusted.

5. A corneal perceptron as defined in claim 4, wherein: the push button (131) is provided with a positioning structure, so that positioning feedback is given when the push button moves to positions corresponding to all scale marks of the effective filament length indication scale (126).

6. A corneal perceptron as defined in claim 5, wherein: the two ends of the handle (120) are provided with hollow cavities (121), and the sliding block cavity (122) is positioned in the middle of the hollow cavities (121) at the two ends; the lower part of the sliding block (132) is clamped at the middle part of the fiber yarn (110), and can drive the fiber yarn (110) to move towards any end of the handle (120) and extend out of the hollow cavity (121) at the end for measurement.

7. A corneal perceptron as defined in claim 4, wherein: the effective wire length adjusting mechanism (130) comprises an adjusting rod (133), and the adjusting rod (133) is connected in a sliding groove arranged at the upper part of the handle (120) in a sliding way; the fiber yarn (110) is fixed on the handle (120), the end part of the fiber yarn (110) penetrates out of the hollow cavity (121) arranged on the adjusting rod (133) or between the adjusting rod (133) and the handle (120), and the adjusting rod (133) can slide outwards from the end part of the handle (120) continuously, so that the effective yarn length L of the fiber yarn (110) outside the hollow cavity (121) is changed.

8. A corneal perceptron as defined in claim 7, wherein: the handle (120) is provided with a clamping piece (123), and the fiber wires (110) are clamped and fixed by the clamping piece (123).

9. A corneal perceptron as defined in claim 7, wherein: the adjusting rod (133) is provided with an effective silk length indicating scale (126) corresponding to the set normal cornea perception percentage.

10. A corneal perceptron as defined in claim 1 or 2, characterized in that: the effective filament length L of the fiber filaments (110) extending out of the handle (120) is a fixed value, and the handle (120) is provided with a pressure indication sleeve for detecting and indicating the pressure born by the front end of the fiber filaments (110); the pressure indication kit comprises a pressure sensor (124) arranged at the side of the fiber yarn (110) and a display screen (125) for indicating the detection result of the pressure sensor (124).

11. A corneal perceptron as defined in claim 1 or 2, characterized in that: the lower end of the telescopic rod (220) is fixed on the base (210); the handle (120) is rotatably arranged on the telescopic rod (220).

12. A corneal perceptron as defined in claim 11, wherein: the telescopic rod (220) comprises a sleeve (221) fixed on the base and a sliding rod (222) capable of sliding up and down in the sleeve (221), a height adjusting scale (223) for indicating the up-down height of the handle (120) is arranged on the sliding rod (222), and a position locking knob (240) for locking the up-down moving position of the sliding rod (222) is arranged on the sleeve (221).

13. A corneal perceptron as defined in claim 11, wherein: the lateral pressing down adjustment sleeve (200) further comprises a rotary connector (230) and a handle locking knob (260); the handle (120) is connected with the rotary connector (230) and can lock the relative positions of the handle and the rotary connector through a handle locking knob (260); the lower part of the rotary connector (230) is hinged with the telescopic rod (220), and an angle locking knob (250) capable of locking the rotation angle is arranged at the hinge position; the telescopic rod (220) or the rotary connector (230) is provided with an angle adjusting scale for indicating the rotation angle of the handle (120).