Diameter2.4 hundredths m
4.5 hundredthsUkulele lengths
300 millionthsCity blocks
1.6 tenthsBird nest diameters
Average adult, anterior-posterior axis
Photo from Wikimedia Commons
Human Eyeball
A 7.5-gram biological camera with 576 megapixels/The Human Body
The human eyeball is roughly 24 mm in diameter and weighs about 7.5 grams. It can distinguish roughly 10 million colors and has an effective resolution of about 576 megapixels. The retina processes images in about 13 milliseconds, making your eyes faster than any camera you've ever owned. They're also the only part of the central nervous system visible from outside the body.
Measurements
Mass7.5 thousandths kg
3.7 billionthsSpace Shuttle launches
750,000Pollen grains
75 trillionthsAircraft carrier masses
About 7.5 grams per eye
Volume6.5 millionths m³
13 quintillionVirus interiors
20.4 trillionthsSupertanker holds
About 6.5 mL
Corneal diameter1.2 hundredths m
3.3 tenthsBanana widths
390 millionthsBlue whale lengths
5.8 tenthsGrape diameters
About 11.7 mm horizontally
Pupil diameter (bright light)2 thousandths m
74.1 billionthsMalta lengths
80Pollen grain widths
4 billionthsLake Michigan lengths
Constricts to about 2 mm
Pupil diameter (darkness)8 thousandths m
178 millionthsUnrolled toilet paper rolls
3.3 thousandthsGolf cart lengths
Dilates to about 8 mm
Image processing time1.3 hundredths s
61.9 millionthsPop songs
7.2 millionthsDog walks
Retina processes an image in ~13 milliseconds
Optic nerve diameter3 thousandths m
224 millionthsBadminton courts
1.2 hundredthsiPad heights
About 3 mm; contains ~1.2 million nerve fibers