Related Clues:

• Faint flicker
• Eye piece?
• It's touching
• Trace, as of hope
• Where rods and cones are
• It's sensitive to light
• Lambency
• Eye liner?
• Twinkle
• Site of some cones
• Secret agent's need
• Site for rods and cones
• Get hold of
• Shine brightly
• Eyeball tissue