OPTOM FASLU MUHAMMED

Not an refractive error Physiological insufficiency of

accommodation Leading to progressive fall in near vn

In emmetropic eye far point is infinity

Near point varies with age After 40 yrs NPA recede beyond the

normal

Decrease in the accommodative power of lens

Age related changes in lens -decrease in elasticity of lens

capsule -increase in size & hardnessAge related decline in ciliary muscle

power

Uncorrected hypermetropiaPremature sclerosis of lensPresenile weakness of ciliary muscle Chronic simple glaucoma

Difficulty in near visionAsthenopic symptoms Intermittent diplopia at near

Optical correctionContact lenses SURGERY

Convex lens Rough estimate of addition 40 -49 yrs : +1.00 to +1.75 50-55 yrs : +2.00 to +2.75 60 & above : +3.00

Add should be adjusted according to working distance required by patient

Eg : +2.50 D at 25 cm +1.00 D at 40 cm

Single vision reading glassesBifocalsmultifocals

Find refractive error for distance Find presbyopic correction Consideration for profession of the

patient Comfortable with weakest convex

lens also prescribed over correction result in asthenopic sym