There are many kinds of eye diseases, the most serious of which are the following: 1. fungal corneal ulcers, such corneal ulcers are very difficult to cure and can lead to corneal perforation or even eye removal in severe cases; 2. funnel retinal detachment, this case vitreous surgery is poor and can even lead to eye atrophy; 3. intraorbital or intracranial tumors compressing the optic nerve, leading to blindness; 4. ocular trauma leading to eye rupture or optic nerve canal fracture, these patients may have no vision at all at the time of injury; 5. wet age-related macular degeneration, once developed, the prognosis for vision is extremely poor; 6. septic endophthalmitis.