CN112155513A - Optical system and method for detecting eyesight by using double-line sighting mark - Google Patents

Optical system and method for detecting eyesight by using double-line sighting mark Download PDF

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Publication number
CN112155513A
CN112155513A CN202011145311.9A CN202011145311A CN112155513A CN 112155513 A CN112155513 A CN 112155513A CN 202011145311 A CN202011145311 A CN 202011145311A CN 112155513 A CN112155513 A CN 112155513A
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parallel lines
line
light
parallel
convex lens
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于红雷
孙俊伟
邹可
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Hangzhou Jimu Technology Co ltd
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Hangzhou Jimu Technology Co ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0016—Operational features thereof
    • A61B3/0041—Operational features thereof characterised by display arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0091—Fixation targets for viewing direction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/103—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining refraction, e.g. refractometers, skiascopes

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  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
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  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

The invention discloses a double-line visual target vision detection system and a method. The method adopts two parallel line light sources as sighting marks, images on the retina of human eyes after passing through a concave lens and a plano-convex lens, completely coincides on the retina by adjusting the distance between the two parallel lines, and further calculates the ametropia of the human eyes according to the comparison between the actual distance of the two parallel lines and the reference distance. The double-line visual target vision detection system established based on the method can complete the detection of the diopter of human eyes without depending on external setting, thereby evaluating the current vision condition.

Description

Optical system and method for detecting eyesight by using double-line sighting mark
Technical Field
The invention belongs to an optical system for vision detection, relates to an optical device, and provides portable and miniaturized myopia optometry equipment.
Background
Juvenile myopia is a problem faced by all countries all over the world, and particularly the rate of myopia incidence in China is the first to live in the world. After myopia, visual fatigue easily occurs, and if the object is not corrected after myopia, the object can be inattentive and dizziness appear after being seen for a long time, so that the learning of teenagers is influenced, and the mental health of the teenagers is also influenced. And the incidence of eye diseases is increased due to the high degree of myopia, and the serious people can cause blindness.
In the early stage of myopia, the myopia phenomenon is not obvious, normal life and study are not influenced, and the myopia becomes serious when the myopia is discovered later, so that the health state of eyes of the teenager can be known in the early stage of myopia or short-term vision deterioration caused by asthenopia. At present, people want to know own vision conditions and go to professional institutions such as hospitals or spectacle stores to perform optometry by equipment such as a computer optometry instrument, the equipment is large in size, and the time cost is very high because the people need to go to the institutions such as the spectacle stores in the hospitals during each test.
Disclosure of Invention
The invention provides a method for judging the human eye refraction state at any time with portability aiming at the defects of the background technology.
The invention adopts the following technical scheme:
a double-line visual target vision detection method adopts two parallel line light sources as visual targets, light emitted by the two parallel line light sources passes through a concave lens, enters from a convex surface of a plano-convex lens and then passes through two aperture diaphragms to limit light beam of a system, two beams of light emitted from the two aperture diaphragms are received by human eyes and form images on retinas. The distance between the two parallel lines is adjusted to ensure that the parallel lines are completely superposed on the retina, and the refractive error of the human eye is calculated according to the comparison between the actual distance of the two parallel lines and the reference distance:
D＝(0.078×H–h)×(25/0.076)
wherein D represents the ametropia, H represents the actual distance when the two parallel lines are superposed on the retina, and H is the reference distance which is the distance between the two parallel lines when the two beams emitted by the two aperture diaphragms are parallel.
Further, the concave lens is located within the focal length of the convex lens.
Furthermore, the two parallel lines are different in color, and the plano-convex lens is plated with a film which penetrates through the light with the corresponding color in half and half according to the two parallel lines.
Further, the two parallel lines are red and green in color, respectively.
Further, the width of the two parallel lines is WpOne pixel of length HpA pixel, wherein WpValue 20, HpThe value is 200.
Further, h is 12.792 mm.
The double-line sighting mark vision detection system based on the method is composed of a display device, a double-concave lens, a plano-convex lens and two aperture diaphragms which are sequentially arranged. The display device displays two parallel lines as a system light source, light emitted by the light source forms an image after passing through the concave lens, the light beams emitted by the system are limited by the two aperture diaphragms after passing through the plano-convex lens, and the two beams of light emitted from the two aperture diaphragms are received by human eyes and form an image on the retina.
Further, the concave lens is located within the focal length of the convex lens.
Further, the two parallel lines are perpendicular to the connecting line of the two aperture diaphragms.
Furthermore, the two parallel lines are different in color, and the plano-convex lens is plated with a film which penetrates through the light with the corresponding color in half and half according to the two parallel lines.
Further, the two parallel lines are red and green in color, respectively.
The invention has the advantages that:
1. the red and green lines are used as visual marks, and the red and green lines observed by human eyes are equivalent to objects at far points seen from the human eyes, so that the eyes are in a relaxed state, and the discomfort of the eyes cannot be caused during testing.
2. The system/method can synchronously give out the ametropia of the eyes, when a tester adjusts the two lines from separation to superposition, and when the two lines are completely superposed, the current ametropia is displayed on the display device, and the testee can obtain the ametropia of the eyes in real time.
3. The method does not use a complex sighting mark, uses the simple position relation of two lines to judge the refractive state of the eyes of the tested person, and the sighting mark state is divided into a separation state and a superposition state, so the learning cost is very low.
4. The method limits the range of the imaging light beam through the two aperture diaphragms, not only eliminates stray light of the system, but also enables the red and green lines to image on the retina more clearly, and solves the problem that a tester with large ametropia degree observes that the edges of the red and green lines are fuzzy, so that the judgment of complete coincidence of the two lines is influenced.
Drawings
FIG. 1 is a schematic diagram of the separation state of the visual targets of red and green lines;
FIG. 2 is a schematic diagram of the overlapping state of the red and green line sighting marks;
FIG. 3 is a diagram showing the position of the optotype and the optical path in the reference state;
FIG. 4 is a diagram of the position and light path of the sighting mark in the state of adjusting the double-line sighting mark;
in the figure, 1 and 2 are two parallel lines, 3 is a display device, 4 is a concave lens, 5 is a plano-convex lens, 6 is a human eye lens, and 7 is a retina.
Detailed Description
The invention provides a double-line visual target vision detection method, which adopts two parallel line light sources as visual targets, as shown in figure 1-2, and a light path diagram thereof is as shown in figure 3-4, wherein light emitted by the two parallel line light sources (1, 2) passes through a concave lens 4, enters from a convex surface of a plano-convex lens 5, then passes through two aperture diaphragm limiting systems to emit light beams, and two beams of light emitted from the two aperture diaphragms are received by human eyes and imaged on retinas. The optical axes of the concave lens 4 and the plano-convex lens 5 are superposed, and the two parallel lines are perpendicular to the connecting line of the two aperture diaphragms.
Fig. 3 is a diagram of the position of the sighting target and the light path in the reference state, in which two beams of light emitted from the two aperture stops are parallel. When the incident light is parallel light, the human eye is in a completely relaxed state, and the incident parallel light is just imaged on the retina.
FIG. 4 is a diagram of the position of a visual target and an optical path in a state of adjusting a bifilar visual target, when the distance between two parallel line light sources is adjusted, the angle of two beams of light emitted from two aperture diaphragms is changed along with the change of the angle of incident light, so that corresponding deviation is generated on the retina of a human eye, when the human eye has a wrong refraction, the length of the eye axis of the human eye is different from that of the normal human eye, the length of the eye axis of a myopic eye is longer than that of the normal human eye, the distance from the retina to a crystalline lens is longer, when the refractive tissue refractive power of the human eye is constant, the imaging position is imaged relative to the retina of the normal human eye, the imaging position of the myopic eye is in front of the retina, so that things can be seen blurry, the two lines are adjusted to be imaged on the retina by changing the emergent light angles of the two aperture diaphragms, so that the two beams, i.e. the two parallel lines coincide.
Therefore, the distance between the two parallel lines can be adjusted to be completely superposed on the retina, and the refractive error of the human eye can be calculated according to the comparison between the actual distance of the two parallel lines and the reference distance:
D＝(0.078×H–h)×(25/0.076)
where D denotes the ametropia, H denotes the actual distance when two parallel lines coincide on the retina, and H is the reference distance, which is the distance between two parallel lines when two beams of light emitted from two aperture stops are parallel, that is, the distance between two parallel lines in the state shown in fig. 3. Can be obtained by simulation and the like.
The two parallel lines are different in color, and the plano-convex lens is plated with the film with the corresponding color respectively in half and half according to the two parallel lines, so that whether the two lines are completely overlapped or not can be conveniently identified. Preferably, the two lines are parallel but offset from each other, as shown in FIG. 1, and when overlapping, are misaligned and overlap for easier identification. In addition, the colors of the two parallel lines are preferably red and green respectively, the red and the green are the colors in the three primary colors of red, green and blue, and no blue light is contained, so that the harm to human eyes can be avoided.
As another preferred scheme, the parallel line light source is provided by a display device, such as an OLED screen, an LED screen and the like, which displays two parallel lines with different colors, and the distance between the two parallel lines can be accurately adjusted by a computer, so that the operation is simple and convenient, and the precision is high. The width of the two parallel lines is WpOne pixel of length HpA pixel, wherein WpPreferably 20, HpPreferably with a value of 200.
The embodiment also provides a double-line visual target vision detection system, which comprises a display device, a biconcave lens, a plano-convex lens, a lens cone and an upper cover with two aperture diaphragms, wherein the biconcave lens is arranged at one end in the lens cone, the other end is provided with a groove, the plano-convex lens is arranged in the groove, the upper cover is arranged above the groove and can prevent the plano-convex lens from falling off, the lens cone end provided with the biconcave lens is fixed on a base through screws, the base is of a cone-shaped lens cone structure, one end with a small diameter is connected with the lens cone, the other end is provided with a display device, the display device can display two parallel line visual targets with different colors and is connected with a computer, a tester can calculate and obtain ametropia degree according to the ametropia calculation formula of the ametropia degree and synchronously display the ametropia display device when the double lines are completely overlapped from separation, the subject can obtain the ametropia of his eye. The system can complete the detection of the diopter of the human eyes without depending on external setting.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should all embodiments be exhaustive. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (10)

1. A double-line visual target vision detection method is characterized in that two parallel line light sources are adopted as visual targets, light emitted by the two parallel line light sources passes through a concave lens, enters from a convex surface of a plano-convex lens and then passes through two aperture diaphragms to limit light beam of an optical beam emitted by a system, two beams of light emitted by the two aperture diaphragms are received by human eyes and form images on retinas. The distance between the two parallel lines is adjusted to ensure that the parallel lines are completely superposed on the retina, and the refractive error of the human eye is calculated according to the comparison between the actual distance of the two parallel lines and the reference distance:
D＝(0.078×H–h)×(25/0.076)
wherein D represents the ametropia, H represents the actual distance when the two parallel lines are superposed on the retina, and H is the reference distance which is the distance between the two parallel lines when the two beams emitted by the two aperture diaphragms are parallel.
2. The dual-line optotype vision testing method of claim 1, wherein the concave lens is located within a focal length of the convex lens.
3. The method for testing eyesight of a bifilar optotype according to claim 1, wherein the two parallel lines are different in color, and the plano-convex lens is coated with a film which transmits light of the corresponding color to each of the two parallel lines in half.
4. The method of dual-line optotype vision testing of claim 3, wherein the two parallel lines are red and green in color, respectively.
5. The method of claim 1 wherein the two parallel lines have a width WpOne pixel of length HpA pixel, wherein WpValue 20, HpThe value is 200.
6. A dual-line optotype vision testing system based on the method of claim 1, wherein the system comprises a display device, a biconcave lens, a plano-convex lens, and two aperture stops arranged in sequence. The display device displays two parallel lines as a system light source, light emitted by the light source forms an image after passing through the concave lens, the light beams emitted by the system are limited by the two aperture diaphragms after passing through the plano-convex lens, and the two beams of light emitted from the two aperture diaphragms are received by human eyes and form an image on the retina.
7. The dual-line optotype vision detecting system of claim 6, wherein the concave lens is located within a focal length of the convex lens.
8. The dual-line optotype vision detecting system of claim 6, wherein the two parallel lines are perpendicular to a line connecting the two aperture stops.
9. The system of claim 6 wherein the parallel lines are of different colors and the plano-convex lens is coated in half with a film of light of the corresponding color according to the parallel lines.
10. The dual-line optotype vision detecting system of claim 6, wherein the two parallel lines are red and green in color, respectively.
CN202011145311.9A 2020-10-23 2020-10-23 Optical system and method for detecting eyesight by using double-line sighting mark Pending CN112155513A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108371539A (en) * 2018-02-06 2018-08-07 腾阅健康科技（深圳）有限公司 A kind of eyes adjust force checking device and method
CN108371538A (en) * 2018-02-06 2018-08-07 腾阅健康科技（深圳）有限公司 A kind of human eye vision monitoring system and method
CN110731750A (en) * 2019-09-26 2020-01-31 浙江大学 intelligent vision detection device and detection method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108371539A (en) * 2018-02-06 2018-08-07 腾阅健康科技（深圳）有限公司 A kind of eyes adjust force checking device and method
CN108371538A (en) * 2018-02-06 2018-08-07 腾阅健康科技（深圳）有限公司 A kind of human eye vision monitoring system and method
CN110731750A (en) * 2019-09-26 2020-01-31 浙江大学 intelligent vision detection device and detection method

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