What is A sign of Aphakia ? and explain in detail?
Ans. is 'd' i.e., Iridodonesis Aphakia Aphakia refers to absence of crystalline lens from the eye. Most common cause of aphakia is surgical removal of cataractous lens. Other causes are congenital absence of lens, traumatic absorption of lens matter and posterior dislocation of lens. The typical signs of aphakia are deep anterior chamber, iridodonesis (tremulousness of iris) and a dark pupillary reflex. Only 1st and 2nd Purkinje images are present, 3rd and 4th are absent. As the lens is not there, eye become highly hypermetropic. Therefore, principle of treatment is to correct the error by convex lenses of appropriate power. Intraocular lens implantation in posterior chamber is the treatment of choice. Other treatment modalities are spectacles and contact lenses.