True for diurnal variation of intraocular pressure (IOP) is
Diurnal variation of IOP: Usually, there is a tendency of higher IOP in the morning and lower in the evening. This has been related to diurnal variation in the levels of plasma coisol. Normal eyes have a smaller fluctuation (< 5 mm of Hg) than glaucomatous eyes (> 8 mm of Hg). Reference :- A K KHURANA; pg num:-210
IOP is usually low in the morning hours
IOP is usually higher in the morning hours
IOP variation is related to plasma acetylcholine level
In normal eye lOP fluctuation is <10 mm of Hg.
Anatomy, Development and clinical examination