Related Clues:

• Heart of a hurricane
• One may be private or lazy
• Part of a symbol on a dollar bill
• Wheel edge
• Slam-dunk circle
• Common observer
• Ophthalmologist's specialty
• It has a focused pupil
• Radial keratotomy target
• Stalk end, on a crab
• Hoop's hoop?
• Study closely
• It has one pupil
• Cyclops' single feature
• Thing surrounded by cilia