Cause The Right Eye Is Minus And Then Left Is Plus?
Hello, I want to ask. My view was not clear, then I checked into optics. From the results of the examination, my right eye was -3 and cylinder -1.5 while my left eye was +2 and cylinder -5. How can it be like that? Six years ago I used glasses with minus-right and left -0.75
There are several abnormalities of eye refraction namely:
Myopia: parallel rays from distant objects fall in front of the retina. Caused because the length of the eyeball exceeds normal or because the refractive force of the visual media is too strong. Correction using a negative spherical lens (-) Hypermetropia: parallel rays from distant objects fall behind the retina. Because the length of the eyeball is too short or because the refractive force of the visual media is too weak. Correction using a positive spherical lens (+) Astigmatism: parallel rays are refracted with different focal points. Caused by irregular corneal curvature. Correction using negative or positive cylindrical lenses. Refractive abnormalities found in one eye can be:
Myopia or hypermetropia simplex: only myopia or hypermetropia only without astigmatism Myopia or hypermetropia astigmatism simplex: astigmatism only cylindrical (-) or (+) Myopia or hypermetropia astigmatism compositus: myopia (-) with astigmatism (-) or hypermetropia (+) with astigmatism (+) mixtus astigmatism: myopia (-) with hypermetropic astigmatism (+) or hypermetropia (+) with myopia astigmatism (-) Generally, refractive disorders of the right and left eye are almost the same. Distinct correction of refraction difference, for example the right eye -1.00 and the left eye -6.00 is called anisometropia. Meanwhile, the difference in refraction for example the right eye S-1.00 (myopia) and the left eye S + 3.00 (hypermetropia) is called antimetropia which is a form of anisometropia as well. Antimetropia that occurs naturally can occur but is very rare, usually found in young children with congenital eye disorders. In adults it can generally occur if there is a history of surgery in one eye, for example removing the eyepiece without replacing it with an intraocular eyepiece. Antimetropia that occurs naturally in adults (for example due to changes in eyeball length) cases account for only 0.1% of all antimetropia cases.
My advice, for your case, because you have used glasses with S-0.75 corrections right and left (myopia simplex) before, you should check your eye condition with an ophthalmologist. A sharp vision check and refraction check at the doctor / optometrist are needed to confirm the results of the refraction you have done on the optics, because the antimetropia and cylinder results in the left eye are large (C-5.00). It is necessary to find out whether it is because there are abnormalities in the media of vision or if there are errors when measuring. Thus the explanation from me, hopefully useful.