What is the irregular that bend light?
The two condition that bend light is abhorrent person, call the irregular that bend light. Generally speaking, two condition of the person that bend light are put generally in longitudinal difference, the person that agree completely is very scarce. Can be an eye is faced up to, another eye myopia, far-sighted, astigmatism; Or two have Qu Guang frame-up, but two degree or sort differ somewhat. In the development process of the eye, far-sighted degree is being reduced ceaselessly, and myopic degree is developing ceaselessly, if two development plan is different, cause the irregular that bend light possibly. Two Qu Guang differ 0.25D, can make twice be become on retina differ like size 0.5% , and the size that two retina resemble the person differs 5% it is the biggest be able to bear or endure accept limit, namely the two irregular that bend light is the biggest be able to bear or endure suffer degree for 2.5D, reason bends the person that smooth irregular is more than 2.5D, meet those who affect a patient look a function.
Have children of the ragged that bend light, when observing an object, an eye is clearer, another eye is more ambiguous, even the eyesight of two eyes is quite ambiguous, form alternant eyesight easily so, soon close, look only far. And because bend the degree existence difference with frame-up light, the size that the content on two eyes retina resembles also is put in difference, the be in harmony of pallium gets like the function bad influence. If differ 5% above, criterion the content of two eyes resembles cannot shirt-sleeve, an eye that can active stayer resembles pallium blurring quite, bend smooth fraudulent number of degrees to compare a large small hole to be able to produce amblyopia. This kind of amblyopia calls amblyopia of sex of the irregular that bend light.
Correctional method -- processing matching lens
The method with the simplest irregular that bend light is to adorn frame glasses, children has bigger adaptability and plasticity, can better to frame glasses land is accepted, prescription can need in the basis when trying lens, to 6. The irregular bending light under 00D should go actively full straighten out or be close to full straighten out as far as possible, and not merit does not exceed 2. The principle place of 50D is manacled. The children of amblyopia of sex of irregular of clinical proof occurrence Qu Guang is passed have correct glasses degree correctional, eyesight can raise 4 about, almost the half can be cured completely. If force of 4 months backsight still did not rise, be about to consider cover cure or atropine to depress therapeutics.
Match the principle with correctional lens
1, double eye all is myopia
Monocular and correctional eyesight can achieve 1.0(5.0) above, match far when using glasses if double eye does not appear diplopia, OK and complete correctional. Be like occurrence diplopia, should decrease appropriately (the degree that can reduce 2.50D) height key point at most. Low spend an eye not to reduce degree, completely correctional. Make double eye eyesight avoids diplopia, maintain certain stereo visual sense, emmetropia (prevent bosseyed) , prevent high eye degree to develop further. If high eye is highest correctional eyesight under 0.2, can reduce high eye degree with low degree of key point is same. Make the left and right sides lens ply, equiponderant, match Dai Mei view is comfortable. If Qu Guang irregular is too big, stereo vision is too poor, the work that cannot complete certain need to locate accurately (if drive, play a ball game, surgical operation... ) , ought to match invisible glasses. Or match to high myopia invisible glasses, close diopter of part of the correctional irregular that bend light is counted, with frame glasses correctional double eye others myopia degree. Won't produce diplopia likewise. Restore good stereo visual sense.
2, a myopia another face up to (without Qu Guang frame-up eye)
To myopia as far as possible correctional raise eyesight, want not to produce diplopia only, match far with glasses, the double eye eyesight that has formed is helpful for maintain and establishing stereo vision and regular key point, prevent to form alternant eyesight, lose stereo sense of sight. If live to need to use an eye for long nearly with the job, ought to deserve in time to use glasses nearly, prevent to bend smooth irregular to expand further. Myopia matchs invisible glasses, OK and complete correctional, far, myopic power is normal, won't produce diplopia.
3, a myopia another for long sight
If monocular correct faces up to force to be able to achieve 1 above, match far when using glasses, presbyopic should completely correctional, myopia is proper (not complete) correctional. Make double eye eyesight not under monocular eyesight, prevent children presbyopic amblyopia and strabismus, stereo vision is normal, avoid to form double small hole alternant eyesight. If presbyopic correct faces up to force under 0.8, after double look is completely correct, double eye eyesight not under myopia eyesight, should completely correctional. If double eye has formed alternant eyesight, should completely not correctional myopia, make myopia develops no longer.
4, double eye all is presbyopic
If double look is correct eyesight is adjacent, double eye eyesight not under monocular eyesight, OK and complete correctional. Should carry on any account to spend a remedial reading otherwise (generation spends myopic vision) gently, reduce the low vision that spend an eye, eliminate diplopia. If high look is correct vision is clear under low spend an eye, and under 0.2, should reduce degree of high eye lens 2.5 degrees, make high key point not effective, double eye degree is adjacent, make far match Dai Mei with glasses view is comfortable.
5, one face up to, a long sight
Presbyopic completely correctional hind, if prep above of double eye eyesight is monocular eyesight, should completely correctional. If double eye eyesight under monocular eyesight, presbyopic need not correctional (not OK low degree correctional, prevent to inspect exhaustion) if; is presbyopic correctional eyesight prep above 0.8 should completely correctional, to face up to an eye to add degree, make face up to an eye to form spend myopic vision gently, double eye eyesight and stereo vision are normal. Prevent presbyopic form the useless amblyopia that use a sex and strabismus.
