What are the causes of eye tremors?

Eyelid trembling?: Trembling of an eyelid, which happens in normal people, is called myokymia (an involuntary, spontaneous, quivering of a few muscle cell bundles within a muscle). Myokymia starts and stops spontaneously. In the eyelids, it can last a few minutes to a few days. One should see an ophthalmologist (md eye doctor) if symptoms persist, keep recurring, or the eyeball is trembling (neurological problem).

Nystagmus: Nystagmus is an involuntary eye movement which usually results in some degree of visual loss. The degree and direction of eye movement, amount of visual loss and resulting impairment varies greatly from person to person. You should check with your doctor, if your eyeball twitches.