Possible Clues:

• Light-sensitive eyeball tissue
• See 1
• Get one in the eye when 'E is involved in a train wreak
• Light-sensing eye part
• It's the background light near it
• Place for rods
• Part of the eyeball
• Only externally visible part of the central nervous system
• Tissue to remove bit of scum from wine
• Artist captures film character in something that helps conjure up image