The question is silly, of course, but it brings up a very interesting point: The human eyeball is remarkably consistent in size for all individuals:
"The eyeball is about 1 inch (2.5 cm) in diameter" (Glencoe Health 2nd Edition)
"The dimensions of the eye are reasonably constant, varying among individuals by only a millimetre or two... about 24 millimetres (about one inch)..." (Encyclopedia Britannica Macropedia: Sensory Reception)
"The adult human eye ... measures approximately 24.5 millimeters in its anterior-to-posterior diameter." (Magill's Medical Guide)
"The eyeball is roughly about an inch in diameter...." (Zinn, Walter and Solomon, Herbert. Eye Care, Eye Glasses and Contact Lenses)
"The human eyeball measures only about 1 inch (25 mm)." (World Book 2001)
(from http://hypertextbook.com/facts/2002/AniciaNdabahaliye1.shtml)