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Eye Size Chart

This chart shows the diameter of eyes for various animal species and then the size of the eyeball at different scales. The measurements are for the total diameter of the eyeball not the iris. I'll hopefully have some resources on irises and pupils at a later time. If you would like to see an animal up here that isn't or can help me fill in the bottom few animals that I haven't been able to track down their eye size please email me or leave a comment at the bottom of the page. If you find this useful I would love to know.

Thanks to the Wetcanvas Reference Image Library for most of the photos, the chicken and squirrel pictures are my own.

Animal Life 1:2 1:3 1:4 1:6 1:8 1:12 Pupil Shape Photo

Temnodontosaurus

(Ichthyosaur)

260mm 130mm 86.66mm 65mm 43.33mm 32.5mm 21.65mm
Unknown
Not Available
Giant Squid 250mm 125mm 83mm 62mm 42mm 31mm 20mm
Not Available

Opthalmosaurus

(Ichthyosaur)

230mm 115mm 76.66mm 57.5mm 38.33mm 28.75mm 19.16mm
Not Available
Blue Whale 150mm 75mm 50mm 37.5mm 25 18.75 12.5
Not Available
Moose 40mm 20mm 13.3mm 10mm 6.6mm 5mm 3.3mm

Horizontal Oval

Horizontal Oval

Not Available
Horse 34mm 17mm 11.3mm 8.5mm 5.6mm 4.25mm 2.8mm

Horizontal Oval

Horizontal Oval

Horse's Eye
Elephant 34mm 17mm 11.3mm 8.5mm 5.6mm 4.25mm 2.8mm
Not Available
Cow 34mm 17mm 11.3mm 8.5mm 5.6mm 4.25mm 2.8mm

Horizontal Oval

Horizontal Oval

Cow's Eye
Deer 30mm 15mm 10mm 7.5mm 5mm 3.75mm 2.5mm

Horizontal Oval

Horizontal Oval

Deer's Eye
Boar 28mm 14mm 9.3mm 7mm 4.6mm 3.5mm 2.3mm
Not Available
Cougar 28mm 14mm 9.3mm 7mm 4.6mm 3.5mm 2.3mm
Not Available
Human 24mm 12mm 8mm 6mm 4mm 3mm 2mm

Round

Round

Human Eye
Dolphin 24mm 12mm 8mm 6mm 4mm 3mm 2mm
Not Available
Bear 22mm 11mm 7.3mm 5.5mm 3.6mm 2.75mm 1.8mm

Round

Round

Not Available
Bobcat 20mm 10mm 6.6mm 5mm 3.3mm 2.5mm 1.6mm

Slit

Slit

Not Available
Fox 20mm 10mm 6.6mm 5mm 3.3mm 2.5mm 1.6mm

Round

Round

Not Available
Great Horned Owl 20mm 10mm 6.6mm 5mm 3.3mm 2.5mm 1.6mm

Round

Round

Not Available
Eagle 18mm 9mm 6mm 4.5mm 3mm 2.25mm 1.5mm

Round

Round

Not Available
Wolverine 14mm 7mm 4.6mm 3.5mm 2.3mm 1.75mm 1.2mm
Not Available
Redtail Hawk 12mm 6mm 4mm 3mm 2mm 1.5mm 1mm

Round

Round

Hawk's Eye
Loon 12mm 6mm 4mm 3mm 2mm 1.5mm 1mm

Round

Round

Not Available
Barn Owl 12mm 6mm 4mm 3mm 2mm 1.5mm 1mm

Round

Round

Not Available
Goose 12mm 6mm 4mm 3mm 2mm 1.5mm 1mm

Round

Round

Not Available
Chicken 10mm 5mm 3.3mm 2.5mm 1.6mm 1.25mm 0.8mm

Round

Round

Chicken's Eye
Otter 10mm 5mm 3.3mm 2.5mm 1.6mm 1.25mm 0.8mm
Not Available
Mallard Duck 10mm 5mm 3.3mm 2.5mm 1.6mm 1.25mm 0.8mm

Round

Round

Not Available
Squirrel 8mm 4mm 2.6mm 2mm 1.3mm 1mm 0.6mm

Round

Round

Squirrel's Eye
Ferret 8mm 4mm 2.6mm 2mm 1.3mm 1mm 0.6mm

Round

Round

Not Available
Painted Turtle 8mm 4mm 2.6mm 2mm 1.3mm 1mm 0.6mm
Not Available
Bullfrog 8mm 4mm 2.6mm 2mm 1.3mm 1mm 0.6mm

Round

Round

Not Available
Rattlesnake 8mm 4mm 2.6mm 2mm 1.3mm 1mm 0.6mm

Slit

Not Available
T-Rex
Veloceraptor
Triceratops
Humpback Whale

* Note: All eye sizes for extinct animals are only estimates based on fossil skulls. Sadly since fossils don't preserve eyeballs I can't give you much guidance on what their eyes looked like aside from reccomending looking at a variety of reptile and bird eyes to see what looks right to you.*

If you aren't comfortable with metric measurements you can convert it to inches using this formula:

(size in milimeters) x .039 = (size in inches)