Download - Introduction to Low Vision
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Introduction to Low Vision
Ifrah Bukhari
Optometrist
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What is low vision?
A level of vision that prevents a personfrom performing customary visionactivities with standard or conventional
optical correction Such patients can benefit for day-to-
day activities by exploitation of
significant usable residual vision withthe help of low vision aids
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Definitions of Low Vision:WHO Definition:
The WHO defines low vision as VA lessthan 6/18-3/60
Modified/Revised Definition:
A person with LV is one who hasimpairment of visual functioning evenafter treatment &/or standard refractivecorrection & has a VA of
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Categories of Low Vision: The International Classification of
Diseases categorizes the LV as:
* In better seeing eye
Definition Visual acuity Visual field
Moderate visual
impairment
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The threshold criteria thatdefines an individual as havinglow vision are an uncorrectable &irreversible VA of
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Blindness:
A blind person is one who is so blind asto be unable to perform any work forwhich eyesight is essential
By WHO definition a blind refers to as VA
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Partially sighted: Person may be considered as partially
sighted if he is substantially &permanently handicapped by defectivevision
Partially sighted are ones who have
some useful vision & may not beclassified as legally blind
Guideline VA levels for partial sightregistration are taken as:
1. 3/60 up to 6/60 with full field2. Up to 6/24 with moderate field
constriction, media opacities or aphakia3. 6/18 or better with gross field defect
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Impact of Low Vision:
Low vision can affect normaldevelopment & education of children &all areas of daily living, work & leisure
for adults The broad areas that LV impacts: education, work & leisure
Social & consumer interactions
Mobility
Emotional reaction to vision loss
Household & personal care
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Self evaluation Test
MCQ,s
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1. The person is considered tobe low vision patient.
A. VA of 6/18 & 6/12
B. VA of 6/60 & 6/18C. VA of 6/36 & 6/9
D. All of the above
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2. Patient is considered to be lowvision patient if
A. VF
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3. Severe visual impaired
A. VA 6/18-6/48 with VF < 5 degree
B. VA 6/60-6/120 with VF < 5 degreeC. VA 6/60-6/120 with VF < 20 degree
D. VA 6/120-6/300 with VF < 10 degree
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4. By WHO definition a blindrefers to as
A. VA
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5. The legally blind are ones who
have in the better eye bestcorrected
A. VA of 6/60 or VF of 10 degrees or less
B. VA of 3/60 or VF of 20 degrees or less
C. VA of 6/60 or VF of 5 degrees or less
D. VA of 6/60 or VF of 20 degrees or less
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Answers
1. B
2. E
3. C
4. A
5. D