Ophthalmology General 4daa18aa What is the value of diurnal variation of IOP above which diagnosis can be made as Glaucoma A 5 mm of Hg B 6 mm of Hg C 8 mm of Hg D 10 mm of Hg High-Yield Explanation Difference of IOP of eye between Morning and night >8 mm of Hg is diagnostic Glaucoma.