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Who can forget the news of the capturing of Osama Bin Laden by our US Special forces? An interesting fact was that the Navy Seal unit that made the capture attributes much of their military success to NVGs (night vision goggles). The capture of Bin Laden, along with numerous captures of Al-Qaeda members in Desert Storm, came from night vision capabilities that were provided by this ocular technology.

The top of the line NVG has a sophisticated four tube version of an earlier model, and...

Diabetic retinopathy is an eye condition that affects the retina in people who have diabetes.

The retina is the light-sensitive tissue that lines the back of the eye, and detects light that is then processed as an image by the brain. Chronically high blood sugar or large fluctuations in blood sugar can damage the blood vessels in the retina. This can result in bleeding in the retina or leakage of fluid.

Diabetic retinopathy can be divided into non-proliferative or proliferative...