Related Clues:

• Builder's guide
• View-finders?
• Seeing things
• Mr. Potato Head piece
• Balls with lids
• Argus's 100
• Some are private
• Sight seers
• Specs
• Optician's wares
• They may be brown or blue
• Construction particulars, briefly
• Microscope parts
• They may hang by the neck
• They may be corrective