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Elevated fluid pressure. The normal pressure is about 10 to 20mmHg, with the majority of people falling between 13 and 19. Over 20 is considered "suspicious" over 24 "cautiously concerned" and warranting immediate investigation, and over 30 is considered to be "urgent" and a potential emergency situation.
Examination of the internal structures of the eye using an illumination and magnification system. Orthokeratology: o-k: a non-surgical procedure using contact lenses to alter the shape of the cornea to effect a change in the refractive error
The optic nerve is a bundle of nerve fibers, about the diameter of pencil, which passes through the back of the eyeball and connects to the nerve fiber layer of the retina. It can be observed directly with an instrument called an ophthalmoscope.
Optic nerve, optic nerve head (ONH)
A non-surgical procedure using contact lenses to alter the shape of the cornea to effect a change in the refractive error