The histopathologic changes of intense reaction involved the whole layer of retina.

The expression of VIP exists on photoreceptor- outer segment, inner nuclear layer and inner plexiform layer of retina and choroids, and weak expression exists on ganglion cell and nerve fiber layer.

A cataract is a painless, cloudy area in the lens of the eye that blocks the passage of light to the retina, the nerve layer at the back of the eye, usually causing vision problems.