News & Reviews

GK Questions and Answers on Human Eye

Human Eye is the most important optical instrument gifted to us by God. It plays vital role as without it we can’t see, observe things surrounding us, colours will be meaningless without eyes etc.Source: www.photobiology.info.comThe human eye mainly works on the refraction of light through a natural convex lens made up of transparent living material and enables us to see things around us. What an eye consists off, what are the common defects of vision, how they are corrected etc are discussed...

Glasses, Contact Lenses and SHTF Situations

 Maintaining good eyesight is of vital importance during a crisis, but it is often overlooked during SHTF planning or preparation. It is important to consider the benefits as well as the limitations of both glasses as well as contact lenses. It is also important that you have up-to-date prescriptions and replacement options on hand as well. Let’s take a look at how you can get ahead of the curve and make sure that your eyesight is as good as possible before, during and after a...

Tiny, lens-free camera could hide in clothes, glasses

A tiny, paper-thin camera that has no lens could turn conventional photography on its head, according to new research.The device, a square that measures just 0.04 inches by 0.05 inches (1 by 1.2 millimeters), has the potential to switch its " aperture " among wide angle, fish eye and zoom instantaneously. And because the device is so thin, just a few microns thick, it could be embedded anywhere. (For comparison, the average width of a human hair is about 100 microns.)"The entire backside of...