Mahatma Gandhi's glasses in the National Gandhi Museum<unk>  are a type of eyeglasses characterised by circular or nearly circular eyerims and a thin metal frame. The style emerged in the 19th century and first became popular in the 1880s. Traditionally the bridge of<unk>  is a "saddle" (a simple, arched piece of metal joining the two eyerims), and hence to prevent the glasses slipping off the face the temples are "riding bow temples" (a strongly arched wire that hooks around the ears); however, in a modern and extended definition,<unk> s typically have a bridge with nose pads and gently curved temples.
Windsor glasses
Browline glasses
Pinhole glasses
Trifocal lenses
Adjustable-focus eyeglasses
Frenzel goggles
Argus retinal prosthesis
Corrective lens