Sudden painful loss of vision seen in
Sudden painful loss of vision : Acute congestive glaucoma Acute iridocyclitis Chemical injuries to the eyeball Mechanical injuries to the eyeball Reference : AK KHURANA COMPREHENSIVE OPHTHALMOLOGY, Edition 4, Page-462
Angle closure glaucoma
Central retinal aery occlusion
Acute uveitis
Endopthalmitis
Anatomy, Development and clinical examination