![]() If the camera’s three inches away from the face as Our Heroine makes the brilliant realization that will Save The Planet, yeah, then you need an incredibly accurate eye. You might well have several models of things like heads and faces. Details of reflections across the cornea, the appearance of a believable iris, and (perhaps most likely) convincing “tiny eye movements,” will be most-important then, and, even then, “only up to a point.” There’s a point of diminishing returns, and it comes up fast. Once you’ve decided upon all the shots in which a character’s eyes are going to be visible and subject to “extreme close-up (ECU)” scrutiny, then you can decide just how much detail is needed to carry the shot convincingly. But in all other cases, well, they aren’t. If you are conscious of it you can spot which look normal and which are afflicted with some ailment.Īlso: if your stated purpose is to create a medical video that must “model a physically-correct (healthy or diseased) human eye,” then all of these concerns of physical accuracy might well be relevant. Maybe good for a tattered character or monster or something but not what you want on a healthy character. The iris is not in good shape and it’s fairly bloodshot too. The first one you posted is one such image. Actually I started one on the wiki back in the day but life happened and unfortunately I didn’t finish it.Īlso be careful of reference images of unhealthy eyes. I’ve been meaning to “port” this tut to a Blender version for the longest. It’s for Maya but all the same concepts apply in Blender. Here’s a great 4-part video tutorial series by Alex Alvarez of Gnomon. Just get the model in similar lighting as a reference photo or two and well, eyeball it. I wouldn’t worry about the exact reflectivity value. …If I am understanding your question correctly. Light passing through at two different points will have a different ray path than light passing through at one. I don’t think adding IOR values is going to do any good, since each time light enters a surface IOR bends it at the angle dictated by the IOR. Do I add those 2 up or do I just do the highest one?Īnd how would I find the exact mirror reflectivity of the eyes, can’t seem to find it on google search. ![]() Optic nerve:Ī bundle of nerve fibers that carry impulses for sight from the retina to the brain.It says that the ior of the cornea is 1.376 and the ior of the aqueous humor is 1.336. The lining of the rear two-thirds of the eye, the retina converts images from the eye's optical system into electrical impulses sent along the optic nerve to the brain. The small, specialized central area of the retina, the macula is responsible for acute central vision. It is continuously produced by the ciliary body, and gives nourishment to the lens and the cornea. It fills the area between the lens and the cornea. This is a thin, watery substance that fills the front part of the eye and gives your eye its form. The vitreous takes up two-thirds of your eyeball. The clear, jelly-like substance that fills the rear cavity of your eyeball. The transparent, biconvex lens of the eye helps bring rays of light to focus on the retina. This expands and contracts, allowing light to enter through the pupil. The colored portion of your eye that surrounds the pupil. The variable-sized black circular opening in the center of the iris, the pupil regulates the amount of light that enters the eye. The transparent front "window" of the eye that covers the iris and pupil, and provides most of the eye's optical power. Following are explanations for some of the various parts of the eye: Cornea: The eye is a very complex organ that is approximately 1 inch (2.54 cm) wide, 1 inch deep and 0.9 inches (2.3 cm) tall. They then send the information to your brain, where it's processed, so the brain knows what's going on outside of your body. Your eyes take in an enormous amount of information about the world around you – shapes, colors, movements and more. Your eyes are working from the moment you wake up to the moment you go to sleep.
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