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Anomalies of refraction
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Anomalies of refraction
1.
REFRACTIVE ERROR Gauri
S. Shrestha, M.Optom, FIACLE
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MYOPIA
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The disc is
often tilted and may be surrounded by chorioretinal atrophy
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Optics of myopia
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Treatment of myopia
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Components of hypermetropia
Due to inherent tone of ciliary muscle Not corrected by ciliary tone within range of patients accommodation can’t overcome by accommodation Total Latent Manifest Facultative Absolute
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Optics of Hypermetropia
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Treatment of Hypermetropia
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Classification; component Total
astigmatism = Corneal astigmatism + Internal astigmatism Corneal astigmatism = anterior cornea Internal astigmatism = Posterior corneal, Lens, Retinal = -0.50DC X 090
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Sturm's Conoid CIRCLE
OF LEAST CONFUSION F 1 F 2 INTERVAL OF STURM Rays of light entering cannot converge to a point focus but forms a focal lines
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Thank you
Hinweis der Redaktion
This represents a decrease in ocular refraction of approximately 3 D for the whole period between 3 and 14 years, when growth appears to be complete.