Term
| How do you measure visual acuity? |
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Definition
| A snellen or logMAR chart |
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Term
| What are the drawbcks of the snellen chart? |
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Definition
1) Accuracy- different numbers of letters on each line
2) Difficult to do statistical analysis |
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Term
| What are the advantages of logMAR over snellen? |
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Definition
1) Equally legible letters
2) Equal numbers of letters
3) Each letter counts towards score
4) Better for low vision assessment |
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Term
| What can be used as a substitute for glasses if testing the eye? |
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Definition
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Term
| What visual acuity is required to drive? |
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Definition
| 6/10. Registration mark at 20m |
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Term
| What qualifies as 'low vision'? |
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Definition
| Acuity< 6/18 or a corresponding visual field loss to <20 degrees (in the better eye with best correction) |
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Term
| What qualifies as 'blindness'? |
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Definition
| Acuity< 3/60 or a corresponding visual field loss to <10 degrees (in the better eye with best correction) |
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Term
| What observations are consistent with a diagnosis of cataracts? |
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Definition
| Blur or less commonly glare |
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Term
| What should you exclude before diagnosing cataracts? |
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Definition
1) A clear cornea
2) Clear vitreous
3) A normal retina
4) No visual field problems |
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Term
|
Definition
A: 60
B: 36
C: 24
D: 18
E: 12
F: 9
G: 6
H: 5
I: 4
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