CGTalk - Proportion of eyeball to skull?

View Full Version : Proportion of eyeball to skull?

kookookrayzy

06-10-2009, 08:48 PM

Hi everyone,
I'm building a 3d human and having trouble with eye placement.

I've seen lots of tutorials for drawing the head (Loomis, Buscema, etc.) that specify the proportion of the visible part of the eye (shown between eyelids); these usually say the head's 5 eyes across in a front view.

I'd like to know how big the actual EYEBALL is in relation to the skull, and how far it sits back in the skull, in relation to the eyesocket.

I've flipped through all my drawing books but can't seem to find this info.
Thanks in advance for any help!!
-kook

mister3d

06-10-2009, 09:07 PM

One eye between eyes and one eye to the end of the skull. About its depth placement, it varies from person to person, and race. Just look at some photos for a reference.

lemiere

06-11-2009, 12:16 AM

Average human eyeball equals 25mm:

http://www.hypertextbook.com/facts/2002/AniciaNdabahaliye1.shtml

http://webvision.med.utah.edu/anatomy.html

Take the height of the figure standing, divide by number of head heights (8 or 7.5), then take two-thirds of one head height to equal approximate head width. Be careful with measuring head width:

http://www.digitalartform.com/archives/2009/03/portrait_lenses.html

It's basically from each side of the cranium.

kookookrayzy

06-11-2009, 01:58 AM

Thanks lemiere, that's exactly what I was looking for. Now I just have to make sure I'm working in real-world measurements, and I think I can figure out the rest.
Cheers!
-kook

PaleoJeepster

07-30-2009, 06:53 PM

The human eye ball is not a sphere. I don't know if it matters for your purposes but the the eyeball is in fact larger front to back (AP). That measurement is 24mm. The eyeball is slightly flattened from top to bottom - the vertical diameter is 23mm, and the horizontal measurement is 23.5mm.

The eyeball is sitting in the anterior part of the orbit of the skull, nearer the roof than the floor and slightly closer to the outside (lateral) margin than it is to the inside (medial) wall.

If you placed a straight-edge from the upper (superior) to lower (inferior) orbital margin of the skull, the cornea would just touch the straight-edge. But a line from the inside (medial) to outside (lateral) margins would have nearly one third of the eyeball in front of it. As a result, blows from the lower outside corner of the socket results in most injuries to the eye.

CGTalk Moderation

07-30-2009, 06:53 PM

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.