More About Clincal Refraction

Question 1

What is anisometropia

Answer 1

Difference in refractive power between the two eyes (more than 4D)

Question 2

Etiology of anisometropia

Answer 2

Congenital
Acquired (unilateral aphakia)

Question 3

Symptom of anisometropia

Answer 3

Double vision ✌️

Question 4

How to treat anisometropia

Answer 4

Contact lens & IOL

Question 5

Anisometropia can not be corrected with glasses.
Why?

Answer 5

Because lead to aniseikonia ( different size of picture between the two eyes)

Question 6

What is presbyopia

Answer 6

It is a loss of accommodation that comes with aging (physiological)

Question 7

Causes of presbyopia

Answer 7

May be dt lens sclerosis and ** decrease of elasticity of capsule**

Question 8

Causes of premature presbyopia (pathological)

Answer 8

Anemia
POAG
Cycloplegic

Question 9

A preson with emmetropic eyes will begin to notice inability to read small print or discriminate close object at about age:

Answer 9

44-46
Late in myopia (after 46)
Early in hypermetropia (before 44)

Question 10

Clinical features of presbyopia

Answer 10

Difficulty in near work
Patient holds a book at greater distance

Question 11

Presbyopia is corrected by:

Answer 11

Plus (conex) lens

Like what?

Question 12

Refractive surgery of choice for myopia up to 12D

Answer 12

Laser in-situ keratomileusis (Lasik)

Question 13

Surgery for myopia of -16 to -18 D

Answer 13

Extraction of clear crystalline lens