They include diseases of the cornea (keratitis), the lens (cataract), increased pressure within the eye (glaucoma), any disease which reduces retinal sensitivity to light impulses (retinal atrophy), or any disease which
affects the optic
nerves or the sight - center of the brain (tumours,
trauma).
Erb's palsy (brachial plexus palsy)-- a condition due to birth
trauma that
affects one or all of the five primary
nerves that supply movement and feeling to an arm.