<prompt> Normal intraocular pressure is2.1-6 mm Hg7-14 mm Hg10-21 mm Hg16-32 mm Hg  <response>: Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 223The intraocular pressure IOP refers to the pressure exeed by intraocular fluids on the coats of the eyeball. The normal IOP varies between 10 and 21 mmHg. 