Anisometropic amblyopia

Introduction There is no strabismus in anisometropic amblyopia, but there is hyperopia or astigmatism at one glance, blurred vision, resulting in refractive amblyopia. Because there is no appearance change, it is often found in school or usual physical examination. I was discovered by looking at the calendar or watch.

Cause

The pathogenesis of anisometropic amblyopia is due to the large difference in the degree of diopter between the two eyes. The appearance of the external scene in the left and right eyes of the macular part varies in size and clarity, resulting in difficulty in the fusion of the two eyes. In order to eliminate mutual interference, the visual cortex center can only actively suppress the eyes with large diopter, and anisometropic amblyopia often forms monocular amblyopia.

an examination

Related inspection

Eye and temporal area CT examination visual acuity screening instrument retinoscopy method corneal mapping method

The diagnostic criteria were adopted in April 1996, the Chinese Society of Ophthalmology National Children's Amblyopia Strabismus Prevention and Treatment Group Working Conference, "The definition, classification and evaluation criteria of amblyopia". All cases were treated with 1% atropine eye drops and optometry. Computer optometry combined with objective retinoscopy. According to the optometry results, the amblyopia was subtracted from the spherical mirror by +1.00D. The principle of the cylinder is unchanged. Consider the age of the child. Too large, relaxation adjustment is more difficult, high hyperopia can be reduced, but not more than +1.50D. Wear glasses to adapt to amblyopia treatment after 1 month. The visual acuity examination adopts the standard logarithmic visual acuity chart designed by Qi Tianrong, and the stereoscopic examination uses the Titmus stereoscopic visual inspection chart.

Differential diagnosis

Differential diagnosis of anisometropic amblyopia:

1. Deprivation amblyopia: Amblyopia refers to eyeball examination normal and monocular or binocular vision is not normal, and the eyesight can not reach 0.8 or above by wearing glasses. According to different types, medical amblyopia is divided into strabismic amblyopia and hemiplegic paradox. There are five categories of amblyopia, form deprivation amblyopia, refractive amblyopia, and congenital amblyopia. Form deprivation amblyopia: In infants and young children, due to corneal opacity, congenital cataract, or ptosis to block the pupil, the light stimulation can not fully enter the eye, depriving the macula of the opportunity to receive normal light stimulation, resulting in functional disorders amblyopia.

2, disuse of amblyopia: disuse of amblyopia refers to in the infancy, due to ptosis, corneal opacity, congenital cataract or cover time due to eyelid surgery is too long, etc., so that light stimulation can not enter the eye, hinder or hinder The broken macula receives the form stimulation, which results in amblyopia, so it is also called to block visual irritating amblyopia.

3, organic amblyopia: congenital amblyopia or organic amblyopia due to birth of macular hemorrhage, resulting in irregular arrangement of cone cells, before the baby's birth after the formation of both eyes, so the prognosis is not good. Although some retinal and central nervous system can not detect obvious lesions, it is still considered to be an organic disease. It can not be found because of the existing examination methods. This type is conserved amblyopia and the treatment is ineffective.

4, strabismic amblyopia: strabismic amblyopia is caused by strabismus caused by diplopia and confusion, the patient feels uncomfortable, the central nervous system actively suppresses the visual impulse of the macula from the squint eye, the eye due to long-term inhibition of the macula, resulting in amblyopia called Strabismus amblyopia.

5. Myopic astigmatism: Myopic astigmatism, also known as simple myopic astigmatism, refers to parallel rays entering the eye. Parallel rays on a main meridian are imaged on the retina, and parallel rays on another meridian perpendicular to it are imaged in front of the retina. It is myopic astigmatism. Focusing on the retina, parallel rays are reflected. In front of the retina, the focus is reflected, and the reflected light is collected. Therefore, it should be corrected by a concave cylindrical mirror.

6, ametropia amblyopia: ametropia amblyopia, both eyes have obvious hyperopia, myopia, astigmatism, can not be blurred by a single eye, even if the optician vision declines quickly. Treatment emphasizes that wearing glasses often, clear vision can restore vision, otherwise it is difficult to recover after serious. Medium and high refractive errors are one of the main causes of amblyopia, and 70% are hyperopic amblyopia. Amblyopia training is performed after correcting refractive errors as early as possible.

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