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4

Yep, in fact there is a 'Reverse Color Blind Test' that is difficult for normal sighted people to pass but is relatively easy for colorblind people to pass. Here's an example: BTW, the word is "NO"


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The value of dilation of the pupil far outweighs the inconvenience.In fact, I'd offer that if an exam is done without it, you potentially lose the following: --full access to all the structure of the retina, macula, and associated blood vessels. Dilation opens up the aperture of the pupil enough for the examiner to see all there is to see. I could fill up ...


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There is certainly an association between reading at short distances and myopia. Here's an article that suggests a possible mechanism: Reading and Myopia: Contrast Polarity Matters Basically, they suggest that reading surfaces which are mostly light (like white paper or screen background) with dark text overstimulate certain retinal pathways and may ...


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Yes you can just close the eyes to relax them. The cure for fatigue is rest. It's not just the intraocular muscles that need to be relaxed. Even the extraocular muscles need the rest. Moreover, it also helps to relax the face muscles and neck muscles. I've recovered from severe eye strain. I know. The 20-20-20 rule didn't work for me, since my strain was ...


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Its for a 'Red-Green duochrome test'. A primary task of the eye care professional is determining the refraction, or optical correction, of a patient. The duochrome red-green test is a standard tool for verification of the final refraction. Traditionally, it is recommended for use both prior to and subsequent to determining the cylindrical or astigmatic ...


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The 20:S notation means that a person with normal vision standing S feet away can see that line on the Snellen chart clearly, but fails to see smaller lines. Size of Letters Required for Visibility as a Function of Viewing Distance and Observer Visual Acuity 3.1 MEANING OF THE SNELLEN NOTATION (page 12) At 20 feet (6 metres), this person with normal vision ...


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Diplopia is not one of the more common symptoms of astigmatism, however it is certainly one of the possible manifestations. In general diplopia (double vision) is categorized as either binocular (you only have double vision when both eyes are open) or monocular (you have double vision even if only the affected eye is open). Binocular diplopia is typically ...


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