According to the Gass classification, what differentiates a stage 3 macular hole from a stage 4 macular hole?

The fact that a stage 4 macular hole is greater than 400 microns
The fact that a stage 3 macular hole is greater than 400 microns
The fact that stage 3 macular holes are associated with a posterior vitreous detachment
The fact that stage 4 macular holes are associated with a posterior vitreous detachment
The fact that stage 3 macular holes are full-thickness

Correct Answer: The fact that stage 4 macular holes are associated with a posterior vitreous detachment

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