What is the diagnostic method of anisometropia?

Abstract: anisometropia exceeds a certain degree, and the binocular monocular function is destroyed. In the immature stage of visual development, in order to avoid the interference of fuzzy images, it will be inhibited involuntarily. Children are not binocular monocular, but monocular monocular., Because the anisometropia is too large, the clarity and size of the object image falling on the retina of both eyes are different (for every 1.0d difference in binocular diopter, the size difference of binocular object image is 2%), the visual center is easy to accept the visual conduction of the eye with clearer object image, and inhibit the object image from the eye with larger ametropia. Over time, the object image of the eye with higher diopter is suppressed to form amblyopia. Even if the ametropia of the two eyes is completely corrected, the size of the object image formed on the retina of the two eyes is different. When the difference between the size of the object image exceeds 5%, it is difficult for the visual center to fuse this large and small object image into one. Therefore, the formation of anisometropic amblyopia is the result of the unequal retinal images of the two eyes and the active inhibition of the image transmission of the one eye with a higher degree of ametropia caused by the difficulty of image fusion in the visual center., As early as 1932, Ames identified binocular anisometropia as an independent field theoretically and clinically. Lancaster made a systematic study of image inequality. At present, there are many instruments for detecting binocular and unequal images in foreign countries. At present, the unequal visual inspection chart is widely used, but it can only check the aberrations on the retina of both eyes, and can not measure the threshold of maintaining fusion and stereopsis. The purpose of binocular vision examination is to determine the threshold of binocular aberration that binocular vision is allowed to maintain. Liu Ainian and Yan Shao Ming used binocular vision in China to divide into two levels: simultaneous vision, fusion of the three levels, the theory of three level stereopsis and the principle of “red and green complementary principle”. The problem of simultaneous measurement of aberration function is solved. So what are the symptoms of anisometropia?,   1. Mild anisometropia may be asymptomatic.,   2. The Anisometropia of monocular vision exceeds a certain degree, and the monocular function of both eyes is damaged. At the stage of immature visual development, in order to avoid the interference of blurred objects, they will involuntarily take inhibitory effect on them. The children are not monocular vision, but monocular vision, that is, only the eye with good vision, and the other eye is abandoned. Monocular vision has no normal depth perception and stereo vision.,   3. After amblyopia forms monocular vision, the retina of the main eye is constantly stimulated by normal vision, and the visual information is transmitted to the visual center through the visual path to form vision. Its visual function can be developed normally. The blurred image of the disused eye and its generated information are suppressed, and the central axis does not respond to the visual information of the eye, resulting in amblyopia for a long time. Generally, The degree of ametropia in amblyopia eye is greater than that in the other eye. A large number of data show that the incidence of hyperopia anisometropia amblyopia is high. In children with anisometropia amblyopia, most of them are hyperopia anisometropia. The degree of amblyopia is related to the age at which anisometropia occurs. The younger the age, the more serious the degree of amblyopia may be. Most scholars believe that, Myopic anisometropia is less likely to cause amblyopia, because the near vision of myopia is mostly normal. At the same time, myopic anisometropia occurs later and rarely occurs in the sensitive period of visual function development. Even if myopic anisometropia causes amblyopia, the degree is often light.,   4. Strabismus amblyopia is not necessarily accompanied by strabismus, but if the visual function of the eye is suppressed and abandoned for a long time, strabismus is easy to occur., Because the Anisometropia of

is too large, the clarity and size of the object image falling on the retina of both eyes are different (the difference of binocular diopter is 1.0d, and the difference of binocular object image size is 2%). The visual center is easy to accept the visual conduction of the eye with clearer object image, and inhibit the object image from the eye with larger ametropia, Over time, the object image of the eye with higher diopter is suppressed to form amblyopia. Even if the ametropia of the two eyes is completely corrected, the size of the object image formed on the retina of the two eyes is different. When the difference between the size of the object image exceeds 5%, it is difficult for the visual center to fuse this large and small object image into one. Therefore, the formation of anisometropic amblyopia is the result of the unequal retinal images of the two eyes and the active inhibition of the image transmission of the one eye with higher refractive error caused by the difficulty of image fusion of the visual center.

as early as 1932, Ames identified binocular anisometropia as an independent field theoretically and clinically. Lancaster made a systematic study of image inequality. At present, there are many instruments for detecting binocular and unequal images in foreign countries. At present, the unequal visual inspection chart is widely used, but it can only check the aberrations on the retina of both eyes, and can not measure the threshold of maintaining fusion and stereopsis. The purpose of binocular vision examination is to determine the threshold of binocular aberration that binocular vision is allowed to maintain. Liu Ainian and Yan Shao Ming used binocular vision in China to divide into two levels: simultaneous vision, fusion of the three levels, the theory of three level stereopsis and the principle of “red and green complementary principle”. The problem of simultaneous measurement of aberration function is solved.

so what are the symptoms of anisometropia?

  1. Mild anisometropia may be asymptomatic.

  2. The Anisometropia of monocular vision exceeds a certain degree, and the monocular function of both eyes is damaged. At the stage of immature visual development, in order to avoid the interference of fuzzy objects, they will involuntarily take inhibitory effect on them. The children are not monocular vision, but monocular vision, that is, only the eye with good vision, and the other eye is abandoned. Monocular vision has no normal depth perception and stereo vision.

  3. After amblyopia forms monocular vision, the retina of the main eye is constantly stimulated by normal vision, and the visual information is transmitted to the visual center through the visual path to form vision. Its visual function can be developed normally. The blurred image of the disused eye and its generated information are suppressed, and the central axis does not respond to the visual information of the eye, resulting in amblyopia for a long time. Generally, The degree of ametropia in amblyopia eye is greater than that in the other eye. A large number of data show that the incidence of hyperopia anisometropia amblyopia is high. In children with anisometropia amblyopia, most of them are hyperopia anisometropia. The degree of amblyopia is related to the age of anisometropia. The younger the age, the more serious the degree of amblyopia may beThey believe that the possibility of amblyopia caused by myopic anisometropia is small, because the near vision of myopia is mostly normal. At the same time, myopic anisometropia occurs later and rarely occurs in the sensitive period of visual function development. Even if myopic anisometropia causes amblyopia, the degree is often light.

  4. Strabismus amblyopia is not necessarily accompanied by strabismus, but if the visual function of the eye is suppressed and abandoned for a long time, strabismus is easy to occur.

  5. Alternating vision occurs in cases with good binocular vision. Both eyes can look at the target and can use two eyes alternately. In another case, the child has myopia in one eye and emmetropia or mild hyperopia in the other eye. He will involuntarily use myopia when looking near and emmetropia or hyperopia when looking far, forming the law of using both eyes instead. Although only one eye is used at a time, he can see far. Adjustment and collection are not used when looking close, so there may be no symptoms.

diagnostic examination method of anisometropia:

can be clearly diagnosed according to the results of binocular optometry.

and

are generally not confused with other diseases.

and

have no special laboratory tests.

and

mainly refer to computer optometry and ophthalmoscopy, which need to be carried out under the condition of sufficient ciliary muscle paralysis, especially for teenagers. It can accurately indicate the degree and nature of anisometropia in both eyes.