Related Clues:

• Periscope part
• Eye piece
• It's see-through
• It helps keep one focused
• Lorgnette part
• Contact, for one
• Something found in specs?
• It helps you focus
• Tool for 64-Across
• Monocle
• Optometry product
• Contact, say
• Microscope parts
• Lorgnette piece
• Optician's creation