Related Clues:

• Part of a focus group?
• Glass in eyeglasses
• Bifocal, for one
• Projector part
• ___ cap
• See 23 Across
• Pince-nez part
• ''Telephoto'' or ''contact'' ender
• You see right through it
• Focusing device
• Cataracts make it cloudy
• Telescope component
• Photog's need
• Glasses glass
• Zoom, for one