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Thread: eye chart on LCD

  1. #1
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    eye chart on LCD

    Im planning to setup an LCD monitor as visual acuity chart for my 10 ft distance refraction room. I dont want to use a mirror so the target are not inverted. Im not going to purchase those expensive lcd eye charts Im planning to use my 22" LCD TV. It has USB port on it and all of my saved visual acuity converted as photo will be detected as I plug my usb on it then use the remote to toggle the other tests randomly. But Im thinking on how to determine the correct height of letters, from the biggest one, 20/200 to the normal vision line (as for me I have to go down until 20/10 because of my test distance). I know that different monitor size can affect the size of the letter. Can please someone help me, Im so confused. I've searched the net but I dont know if I understand it correctly. I also read some suggestion and there is this one that uses his/her TV to display the snellen to the patient. Well I guess its really possible
    Thanks

  2. #2
    What's up? drk's Avatar
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    1. You are going to overplus everyone at 10'. You can do the math on that one.
    2. Remember that 20/20 means optotypes with an arc of 5 minutes, and 1 minute of detail on the "strokes". You can do the math on that one.
    3. Mirrors don't invert.
    3. You did not go to optometry college, did you? Because this is Optics 101. How about being honest, and maybe you'll get some help.

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