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Refractive errors (Hyperopia (Cornea and Lens cannot refract light enough,…
Refractive errors
Hyperopia
Cornea and Lens cannot refract light enough
point of convergence ends up behind the retina
farsightedness
"eyes too short" for the refractive power of the cornea and lens
Correct with convex, converging lens
Myopia
Cornea and lens refract light too much
light ends up converging in front of retina
Eye is "too long" for the refractive power of the cornea and lens
Correct with concave (diverging) lenses
Astigmatism
Abnormal curvature of cornea
different refractive power at different axes
Correct with cylindrical lenses
nearsightedness
Presbyopia
aging related impaired accommodation
less lens elasticity
patients often need reading glasses, distance vision is normal, problems focusing on close things
changes in lens curvature
less strength of ciliary muscle
Cataracts