What is optical Actuity?
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ok, well think about what the resolving power means, first.  \n\nit says that if you take 2 point-like objects, and bring them closer and closer together, then your eye (or some optical instrument) will have a lower limit in terms of seeing them as 2 individual objects.  at some distance apart from one another, they will simply blur together and look like a single object or blobby thing.\n\nnow obviously, if the 2 objects are closer to your eye, then you can see them better, so the "distance between objects" is maybe not a very good way of determining your resolving power, because it depends on where the objects are.\n\na distance-independent way of stating the resolving power is in terms of the ANGLE between the objects.  this is the angle formed by the line that goes from object 1 to your eye, and the line that goes from object 2 to your eye.  for any given eye, there is some angular separation between 2 objects below which distinct objects cannot be resolved.  this angle is called the resolving power.  (radians are just a unit of angle, like degrees.  there are 2 * pi = 6.28 radians all the way around a circle.) \n\nso, if you think about it, someone with sharper vision can resolve 2 point-like objects that are closer together than can someone with poor vision.  this corresponds to a *smaller* angle because they're closer together.  so a small value for resolving power corresponds to sharp eyesight.\n\nas for optical or visual acuity, that is simply the reciprocal of the resolving power.  that means that a *larger* value means sharper eyesight.  in a medical context, visual acuity is usually expressed as something like 20/10 (which equals 2) for very good eyesight or 20/100 (which equals 0.2) for poor eyesight.  as you can see, the larger the value, the better the eyesight.\n\nhope this helps!\n\nps - have a look at this website if you need more info:\nhttp://www.tedmontgomery.com/the_eye/acuity.html
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Something with lenses and light!
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From Wikipedia: "The visible spectrum (or sometimes optical spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. There are no exact bounds to the visible spectrum; a typical human eye will respond to wavelengths from 400 to 700 nm, although some people may be able to perceive wavelengths from 380 to 780 nm."
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Bifocals and lightning rod.
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Short sightedness :-\nalso known as myopia\nArises either frm a decrease in the focal length of the lense or frm an elongation of the eyeball!!Such a person  cant c distant objcts clearly.\nLong sightedness:--\nalso known as hypermetropia\nFor various reasons the eyeball of a person may contract in size or the focal length of the eye lense can increase..Such a person cant c objcts placed very near to the eye>>(note THAT PEOPLE WITH NORMAL VISION CAN C OBJCTS PLACED NEARER 2 THE EYE BY 25cms but a long sighted persn can c only when the objct is placed a little further than 25cms.
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Reflection of flashlight in the retina.\n\nFurther details:
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if you are nearsightedness this sight will probably help you.\n\n\n\n\n\nreversingnearsightedness.com
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Basically, OTs, COAs, COTs, and any other similar credentials means one thing.  They are kind of like eye nurses.  OT stands for ophthalmic technician.  COA stands for certified ophthalmic assistant.  I am an ophthalmic assitant, OA.  Depending upon the practice, these people have different duties.  In my practice, the techs do whatever the doctor needs.  In reference to low vision, I suppose the tech might have a say in the type of services you may need, with the doctor having last say.  They may teach the patient how to use devices, or simply be there to answer questions.  These people assist the doctor in exams as well.  SO basically, they are there to take care of you and address any questions or problems you might have, don't be afraid to ask, worse case scenario is that they will not know, and then they will ask the doctor!
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The word you are looking for is Phosphene.\n\nPhosphenes are the light sensation you experience often from pressure/stimulus on your retina.
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Do you mean bifocals or trifocals which are worn by older people to compensate for needing to see far (nearsightedness) and having a problem reading.\n\nReading glasses only work for reading and close work like embroidery or scrapbooking. You can't read signs, clocks across the room, etc.
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The light gathering power and resolution are determined by the size of the objective lens, but not of its focal length. The ease of going to higher powers is determined by focal length.
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Although your brain generally filters it out, the human eye has a fair amount of chromatic aberration. Blue and violet light in particular tend not to come to a sharp focus, so filtering it out adds to visual acuity. At greater distances, it also helps cut haze, as short wavelengths (blue end of the spectrum) are scattered more than long wavelengths.
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The visible spectrum (or sometimes optical spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.\n\nCheck the attached link for visible response.
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Strabismus.  Tend to focus with one eye.
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http://www.seeingwithsound.com/etumble.htm\nhttp://www.howstuffworks.com/artificial-vision.htm\nhttp://www.wired.com/wired/archive/10.09/vision.html
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yea there are many simple tests like that but i find this one to be very good\n\nhttp://www.albinoblacksheep.com/flash/vision.php
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http://illusionsetc.blogspot.com/\n\nhttp://www.panoptikum.net/optischetaeuschungen/opticalillusions.htm\n\nhttp://images.search.yahoo.com/search/images?p=optical%20illusions&fr=FP-tab-web-t&toggle=1&cop=&ei=UTF-8\n\nhttp://search.yahoo.com/search?p=optical+illusions&fr=FP-tab-web-t&toggle=1&cop=&ei=UTF-8