What is the difference between cylindrical and spherical eye lenses? I can see clearly by both in different numbers, so which one shall I go for?
What is the difference between cylindrical and spherical eye lenses? I can see clearly by both in different numbers, so which one shall I go with?
What is the eye vision of someone with spherical power -5 in both eyes? Is it 6/12 or more? I'm having short sight with lens power -1.75 both eyes. How can I compare it with 6/6 vision? Which contact lenses are good for cylindrical power? You have a pair of unpolarized sunglasses, a pair of polarized 3D viewing glasses and a large supply of flat mirrors. Can you tell the two glasses apart? What are the cylindrical powers in eyes? A normal human eye can see objects between 25cm and infinity. Can we see objects which are placed closer than the minimum distance using a lens? What is the actual difference between f/1.8 and f/2.2 apertures in camera lenses? How the 3D glasses work? Are there any kind of contact lenses made for cylindrical -0.5 power? What is the difference between a prime lens and zoom lens? How much better is two eyes than one eye? How do I know that my spectacle lens bought from Lenskart is an original British optics lens? Is the difference between glasses with prescription lenses and glasses with plain glass lenses readily noticeable? What is 20/25 vision? What does it mean? Is it better or worse than 20/20 vision?  What does "equivalent lens" mean? How do you explain it to a beginner? Which one should I buy between: a 50 mm and 18-55 mm lens? What is the difference between a portrait lens and a macro lens? What is the difference between Ray Ban's G-15 lenses and their polarized lenses? What 3D glasses should be used for the HP Pavilion 15 p-233cl? What are the merits and demerits of wearing contact lenses instead of spectacles? What do you prefer, contact lenses or spectacles? Can you share your experience with both? Which lens is good, 18-135 or 55-250? The doctor told me that I am short-sighted in one eye only, and the other eye is perfect. How can this be? What does it mean when a camera has XXmm lens and X.X aperture? Which is better, wearing spectacles, contact lenses, or having a Lasik operation in the eye? What does it look like inside a spherical mirror? In what way I should arrange two convex lenses to get highest magnification? Also tell,what should be their focal lengths? Do I need 3D glasses for 3DS? What kind of eye shape do I have? Regarding the image quality which is better the 18-135mm lens or the 18-55+55-250mm lenses?