A lens Rx for -14 Diopters tells us you have a very, very high degree of nearsightedness (myopia). This would be considered in the "severe" range. Of all the people who are myopic, less than 2% are worse than -10 Diopters. Myopia, however, is not a...
It's a 19th Century myth that humans' sense of sight and smell is weak compared to the rest of the animal kingdom. The thing that probably stops most predators from killing us, over the course of our evolutionary history, is that we see them before they...
There are two conventions used among eye doctors on how to notate a typical glasses prescription: minus cylinder or plus cylinder. They are functionally the same (at least at the level of accuracy required in spectacle lenses). In effect, it depends on whether you measure from...
Well, not everybody does! Cataract surgery is the replacement of the clouded, natural lens of the eye with an artificial intraocular lens (IOL), or "lens implant." Despite the tremendous advances in ophthalmic technology, there is still no IOL that has been developed that can successfully reproduce the...
Not really. A "color" is what we call a categorization within our conditioned brain of a particular combination of not just wavelength, but saturation and hue. Color is not really "out there." But the different wavelengths of light are really "out there."Am I just playing...
