Symptoms depend on which muscles are affected. For example, when weakness affects muscles of the chest, people may have difficulty breathing. When weakness affects muscles that control the eyes, people may have double vision. Complete muscle weakness causes paralysis.
The choroid is the layer of blood vessels and connective tissue between the sclera (white of the eye) and retina. It is part of the uvea and supplies nutrients to the inner parts of the eye.
The eyeballs of humans and the eyeballs of cows have a similar structure overall. Both have the sclera, which is the white part of the eyeball, cornea or the clear structure over the iris and pupil, lens, vitreous fluid, retina and choroid.The choroid is the layer of the eyeball that is between the retina and the sclera.However, despite the. many similarities, there are differences between. a cow eye and a human eye. The radius of the average cow. eyeball is about 1/2 inch (15mm). with a diameter of 1.2 inches. (30mm).The human eyeball. size varies, but on average. it is 1 inch (24mm).oth have the sclera, which is the white part of the eyeball, cornea or the clear structure over the iris and pupil, lens, vitreous fluid, retina and choroid. The choroid is the layer of the eyeball that is between the retina and the sclera.