Related Clues:

• Gem viewer
• Watchmaker's magnifier
• Watchmaker's eyepiece
• Flaw-spotting aid
• Gem grader's aid
• Jeweler's magnifying tool
• Jeweler's device
• See 20
• See 12
• See 11
• See 6
• Shows at which glasses are required?
• Shows that can be seen through
• Shows put on for the pupils' benefit
• Sights for sore eyes?