<unk>  is an either temporary or permanent visual impairment during and following exposure of a varying length of time to a light<unk>  of extremely high intensity, such as a nuclear explosion,<unk>  photograph, lightning strike, or extremely bright light, i.e. a searchlight or laser pointer or landing lights or ultraviolet light. The bright light overwhelms the retinas of the eyes and generally gradually fades, lasting anywhere from a few seconds to a few minutes. However, if the eyes are exposed to a high enough level of light, such as a nuclear explosion, the blindness can become permanent.<unk>  may also occur in everyday life. For example, the subject of a<unk>  photograph can be temporarily<unk>  blinded. This phenomenon is leveraged in non-lethal weapons such as<unk>  grenades and laser dazzlers.
Flash blindness
Color blindness
Tunnel vision
Red eye 
Black eye
Childhood blindness
Macular corneal dystrophy
Corneal dystrophy