This week we have started to look at our senses and how they can change with age. We first looked at the eye. There are 3 different layers of the eye: the Fibrous Tunic, the Vascular Tunic and the Nervous Tunic. The fibrous tunic contains the white and opaque area known as the sclera, and the cornea. The vascular tunic contains the choroid coat, the ciliary body, and the iris. The nervous tunic contains inner nervous tissue layers, robs and cones, and this is where the nerve fibers synapse to form the optic nerve. Some of the age related changes with the eye are: slight shrinkage of the eye, increase in connective tissue, degeneration of cells, reduced blood supply, skin of the eye lid thins, and there is a loss of fat and elastic tissue around the eye. Other conditions related to aging are glaucoma, diabetic retinopathy, cataracts and macular degeneration.
I found a video that further explains how light enters our eye. The link is: http://www.youtube.com/watch?v=15P8q35vNHw
No comments:
Post a Comment