Viva 6

............................

In a general clinic, you come across the following lens changes. Look at each picture and answer the questions.   Suggest two possible causes for this lens appearance. Does it affect the vision? Answer There is a circular imprint of pigment  on the anterior capsule from the iris. This may result from previous  posterior synechiae or trauma (Vossiu's ring). It is of no visual significance. What may be responsible for this lens changes? Answer Rosette cataract. This is typical of  traumatic cataract resulting from blunt  injury. The cataract begins in the  subcapsular region and with time  become buried in the cortex. Vision is usually reduced. What is likely to be responsible for this lens appearance?  Answer There is a star shaped opacity in the  anterior subcapsular area. This is seen in patient on chlorpromazine for more than 2 years.   How is the patient's vision likely to be affected? Answer Vision may be normal as this type  of cataract seldom causes significant visual impairment. Click here for the next question