Glaucoma is when the optic nerve in the eye becomes damaged. The different stages of narrow angle glaucoma relate to the extent of the damage to the optic nerve and the level of pressure in the eye.

This type of glaucoma can develop after an injury, or trauma, to your eye. Although it can't be cured, there are treatments to stop it from stealing your sight if it's diagnosed early. Glaucoma is a ...

Gear tooth geometry is determined primarily by pitch, depth, and pressure angle. Pitch: Standard pitches are usually whole numbers when measured as diametral pitch P, the ratio of the number of teeth ...