[Possible reasons for hypercorrection and incomplete correction of refractive anomalies using photorefractive surgery].
Probable variants of relationships between the major parameters of the eyeball, such as thickness of the cornea, its curvature radius, limbus diameter, and length of the anteroposterior axis of the eye are analyzed on a model representing the structure of external capsule of the eye with the use of schemes. Numerous combinations of these parameters of anatomical structures of the eye are responsible for hypercorrection and poor correction of refraction by examer laser surgery, by photorefraction keratectomy in particular. Along with well-known factors causing regression in remote periods after photorefraction keratectomy (corneal regeneration, effect of ophthalmic tone, accommodation spasm, etc.), individual variants of eye anatomy, neglected during laser exposure planning, can lead to unsatisfactory results of laser treatment.
Rumiantseva
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D006801:Humans; D013508:Ophthalmologic Surgical Procedures / Q000379:methods / Q000592:standards*; D054140:Refractive Surgical Procedures