Related Clues:

• Taxis list them
• They often have glasses in front of them
• Where to find contacts
• Centers, of sorts
• Center cuts of beef
• Winkers
• Place for pupils
• Assesses value
• Billing info
• Loser's weepers?
• Colon in an emoticon
• Orbs
• ''Electric'' sensors
• Optometrists' concerns
• They may be black or blue