Ophthalmology Normal diurnal variation of intraocular pressure is: A 0-2 mm of Hg B 2-3 mm of Hg C 3-6 mm of Hg D 6-8 mm of Hg 💡 Explanation Normal diurnal variation of intraocular pressure is: ✓ Correct Answer: C. 3-6 mm of Hg