- The space in front of the iris and behind the cornea.
- The outer, transparent, dome-like structure that covers the iris, pupil, and anterior chamber; part of eye's focusing system.
- A physician who is qualified and especially trained to diagnose and treat all eye and visual system problems, as well as diagnose general diseases of the body. An ophthalmologist prescribes lenses to improve visual acuity.
- The sharpness of vision, the ability of the eye to distinguish detail.