The WHO Definition of Low Vision Visual acuity 6/60 to 6/18 in the better eye with best correction.

Question 47

The WHO Definition of Low Vision
a. Visual acuity 6/60 to 3/60 in the better eye with best correction.

b. Visual acuity 6/60 to 6/18 in the better eye with best correction.

c. Visual acuity 6/18 to 3/60 in the better eye with best correction.

d. Visual acuity <3/60 in the better eye with available correction.

Answer

b. Visual acuity 6/60 to 6/18 in the better eye with best correction.

Reference:

Renu Jogi 3^rd edition Page 441

Quality

Reader

Status

Repeat

QTDF

Journals

Discussion

Definition Low Vision given by WHO is

Ä     Visual Acuity in the better eye with best correction is less is 6/18 and equal or more than 6/60

Explanation

Self Explanatory

Comments

Categories of Visual impairment (WHO)
Categories			Visual Acuity with best correction (better eye)
			Maximum vision (less than)	Minimal vision (equal to or more than)
Normal				6/18 on Snellen Chart
Low Vision	1	Low Vision	6/18 on Snellen Chart	6/60 on Snellen Chart
	2	Economic Blindness	6/60 on Snellen Chart	3/60 on Snellen Chart
Blindness	3	Social Blindness	3/60 (finger counting at 3 metres)  or visual field constricted to less than 10o	1/60 (finger counting at 1 metre)
	4	Manifest Blindness	1/60 (finger counting at 1 metre) or visual field constricted to less than 5o	PL (light perception)
	5	Absolute Blindness	No Light Perception (No PL)

Tips

Visual Impairment disability categories basedon its severity and proposed disability percentage (Government of India)
Categories	All with best correction		Percentage impairment
	Better eye	Worse eye
Category 0	6/9 -6/18	6/24 – 6/36	20 %
Category I	6/18-6/36	6/60 to Nil	40 %
Category II	6/60-4/60 or Field of Vision 10o to 20o	3/60 to nil	75 %
Category III	3/60 to 1/60 or Field of Vision less than 10o	Finger counting at 1 feet to nil	100 %
Category IV	Counting fingers a 1 feet to nil or Field of Vision less than 10o	Counting fingers a 1 feet to nil or Field of Vision less than 10o	100 %
One eyed person	6/6	FC at 1 ft to Nil	30 %