According to the Gass classification of idiopathic macular holes, a full-thickness macular hole accompanied by complete posterior vitreous detachment corresponds to which stage?
- A Stage 4 ✓
- B Stage 2
- C Stage 3
- D Stage 1b
Correct answer: A. Stage 4
Explanation
Stage 4 denotes a full-thickness hole with complete separation of the posterior hyaloid from the macula and optic disc, often visible clinically as a Weiss ring. Stage 3 is also a full-thickness hole but retains central attachment of the vitreous to the optic disc, which is the single fact that separates options C and A. Stage 2 is a smaller eccentric full-thickness defect with vitreofoveolar adhesion.
Reference: Ryan's Retina, 6th ed.
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