how do progressive contact lens work?
401186
It's called simultaneous viewing.  You actually look through the distance, near, and intermediate portions of the lens at the same time (they're each determined by a different curve on the lens).  Your brain automatically selects the clearest image.
262999
Sure u can.U can purchase them from your  nearest optometrist that provides contact lenses.
232701
Tinted contacts help to create more contrast and eliminate shadows, thus making images more crisp. I think the lenses are tinted amber (yellowish-orange) for outdoor sports.
22231
an antireflective coating is a very thin film of some material that is put on the surface of a lens.  the thickness of the coating is very important.\n\nthe way they work is that light is reflected at any interface between two kinds of materials.  at the air-film interface, some light is reflected, and most passes through.  then at the film-lens interface, some more light is reflected.  now, light is a wave, and so if the thickness of the lens is exactly a quarter of the wavelength of the light, the two reflected waves will cancel each other out.  this actually causes more light of that wavelength to pass through the lens than would pass without the coating.\n\nnote that this only works for a particular wavelength.  for glasses and optics the human eye looks through, usually the coating is made to pass more green/yellow light, since this is where the eye is more sensitive.  this causes the red and blue ends of the spectrum to appear to be brighter and is what gives anti-reflective coatings their characteristic purplish color.
933597
Wearing contact helps - coz ur center does not change - and has more sharp / focus than glasses.\nIf u follow eye related healthy diet/exercise - u can get by with a smaller no, like  -1.75 for starter, and help it reduce further (coz ur eye will not suffer strain from change of optical centers, etc - as is with glasses...\nTheoretically, one cannot go beyond 20/20, it is perfect vision...
962189
Basically it spreads from contact.  Most of the time from touching something someone who had this touched and then touching your own eye.
9297
Hard and soft contact lenses are prescribed and fit differently.  (You can't just take your hard lens prescription and order soft lenses from it.)  Astigmatism in general is correctable with either type of lens.  Only your eye care provider can tell you if soft lenses will work for you, so make an appointment to see your optometrist or ophthalmologist.  You should also be sure to have a yearly complete eye exam to make sure that there aren't any problems with your contact lenses and to check the overall health of your eyes.
416595
I've worn hard contact lenses since Adam was a boy and with no problems at all. Contrary to what others may say, they are not difficult to put in (your eyes), it just takes a little practice. Of course proper hygiene is necessary (wash your hands before you put them in or take them out, clean them daily and store them in fresh solution). See an eye care specialist and don't buy cheap lenses.
732770
Well an astigmatism does make comfortable contact wearing difficult (but not imposible). What kind of contacts do you have? You should ask to try  acuvue for astigmatism. My dad wasn't able to wear contacts either(he has an astagmatism to), but this brand has worked out great for him. Also try vasine eye drops. Also Renu contact solution is the best to help keep moisture in. I would say maybe try another doctor, but don't give up yet. Trust me the effort is worth it. Hope this helps!
216545
Not yet.  It's very popular in glasses right now, so I'm sure there's a company somewhere trying to figure out how to get it to work in contacts.
188928
If they are the same prescription they will work the same, but you see differently out of each, just give your eyes about a minute to adjust from one to the other.  ]\n\nI used to wear glasses, but I have wore contacts for about ten years now.  I don't like wearing my glasses anymore...only before bed-time!
794669
You might want to look into something called "shooter's glasses".  Mention these to your eye doctor and they will know what you're talking about.  Some very skilled players such as Karen Corr and snooker player Dennis Taylor use these types of lenses.  I don't know if contact lenses are an option, but that will provide you complete peripheral clarity.  As human beings, we don't have a lot of experience looking in the uppermost region of our range of vision.  People tend to look downward or straight across, mostly to make sure we are stepping safely.  Happy Shooting.  M.D.-BCA Instructor/Referee.
664933
A convex lense is made up of individual prisms arranged in such a way that the pointed axis, which is suppossed to be the top, of one is alined to the base of the other. \nWhen ligh hits the lense, refraction occurs due to the arrangement of the prisms.\nAt the principal axis, two of these prisims are facing one another tip-to-tip in which case the light does not neccessarily pass through any of the prisms itself but through the interface of the apex of the two adjoining prisms.\nThe reverse is true for concave lesnses.
482742
Micro electronics that you could see through. Nanobot technology. Using the contact lens as a focus lens. Tapping into the human body's natural electricity as a power source. Possible in a few years. \n\nIf the contact was a colored contact you couldn't see through, highly possible now.
884982
No, you have a different eye exam for contacts, so the same script wouldn't work  -  it's a different type.
756657
I believe you are asking if hard contact lenses can improve your vision beyond when they are in your eyes as opposed to if they work for vision correction.  Nothing can permanently correct your vision other than surgery.  While theoretically hard contacts can push on your eye enough to change its shape and therefore theoretically change vision, once you remove them, the eye will assume its normal shape pretty quickly.  But, it's probably not a good idea to push on ones eyeball, which is why those hard contact lenses are so rarely used these days.
315837
Normally.. everyday use....How do polarized sunglasses work? Well, we are all aware of the fact that light reflection from surfaces like a flat road or smooth water has a horizontal polarization. Such horizontally polarized light is then blocked by the polarizers in the lenses which are vertically oriented. Thus, we can ensure proper eye protection.\n\nThere has been no clear evidence that NIGHT driving with polarized glasses does any good.