Defects in visual acity
Refractive Errors
Vision is best far awaay, farsightedness
Hyperopia
Loss of elasticity in lens, a form of farsightedness
Presbyopia
Focus before retina, nearsightedness
Myopia
Focus unevenly or diffusely, variations in curvature
Astigmatism
Possibly genetic, sometimes traumatic
Etiology of Refractive Errors
Squinting, rubbing eyes
Signs and Symptoms of Refractive Errors
Eye chart, ophthalmoscope
Diagnosis for Refractive Errors
Corrective lenses
Treatment for Refractive Errors