non- - ocul
- non-contact tonometer
- non-infectious
- non-metastasizing
- non-myelinated
- non-specific
- non-ulcerative keratitis
- normal-tension glaucoma
- notch
- nuclear cataract
- nuclear sclerosis
- nucleus
- nucleus of crystalline lens
- nurse
- nutrition
- nyctalopia
- nystagmograph
- nystagmus
- obesity
- objective refraction
- oblique astigmatism
