There are approximately 120 million rods and 6 million cones in the retina which help us to see, but did you know there is another type of light sensitive cell there? Intrinsically photoreceptive retinal ganglion cells are a type of cell in our retina that has nothing to do with our vision.
Even when we close our eyes, they are active. They are buzzing with the metabolism and regeneration of visual pigments. You can think of it as the TV not being shut off, but changed to a fuzzy picture.
Ever wonder how night vision goggles work? Most work by detecting and amplifying infrared light. We can't see infrared light but it's there. Trees and buildings give off low levels of infrared light. Humans and animals emit more.
Ever notice how they sometimes seemingly spin backwards? What's up with that? Well, I did a little digging and found that the phenomenon of car wheels appearing to spin backwards in movies is dubbed "The Wagon Wheel Effect."
I've heard my patients claim that they thought this is just a normal part of the aging process; however, nothing could be farther from the truth. In fact, dry eyes are about as normal as chronic headaches, toothaches or loss of bowel control.
This past week 11 Libyan physicians, including diabetes specialists, ophthalmologists and pharmacists, participated in an intensive three-day certificate program in 'Retinopathy Screening for Primary Care,' in Istanbul, Turkey.