Also, does Iridodonesis cause Visual impairment?? And is the disease genetic??

Iridodonesis is a "Shift of lens position, even though slight can also cause loss of iris stability and resulting in tremlousness to slight ocular movements or vibrations"

I need to know for a Roleplay Im doing, where I want my character to have this disease, but there seems to be not enough info on the web :C