Question:
Astigmatism in an emmetropic eye of an elderly person contributes to (the threshold above which laser/bioptics correction is needed):
Astigmatism in an emmetropic eye of an elderly person contributes to (the threshold above which laser/bioptics correction is needed):
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The cut-off above which LRIs fail and bioptics is needed.
Updated On: Jun 23, 2026
- +1D
- +2D
- +3D
- +4D
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The Correct Option is C
Solution and Explanation
Step 1: Pre-existing corneal astigmatism becomes clinically important during cataract or presbyopia-correcting intraocular lens (IOL) surgery in the elderly.
Step 2: When the level of pre-existing astigmatism is high, defined as more than 3 D, simple methods such as limbal relaxing incisions (LRIs) are unlikely to fully neutralise it, and a bioptics approach (IOL implantation followed by laser vision enhancement with LASIK or PRK) may be needed.
Step 3: The clinically quoted cut-off value here is +3 D. Values of +1 D or +2 D are within the range LRIs can handle, and +4 D is simply above the same +3 D threshold, so the threshold figure itself is +3 D.
Step 4: Hence the answer is +3D, option (c).
Step 2: When the level of pre-existing astigmatism is high, defined as more than 3 D, simple methods such as limbal relaxing incisions (LRIs) are unlikely to fully neutralise it, and a bioptics approach (IOL implantation followed by laser vision enhancement with LASIK or PRK) may be needed.
Step 3: The clinically quoted cut-off value here is +3 D. Values of +1 D or +2 D are within the range LRIs can handle, and +4 D is simply above the same +3 D threshold, so the threshold figure itself is +3 D.
Step 4: Hence the answer is +3D, option (c).
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