Page 3 of 3 FirstFirst 123
Results 51 to 66 of 66

Thread: Misinformation 101

  1. #51
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
    Join Date
    May 2000
    Location
    Seaford, NY USA
    Occupation
    Dispensing Optician
    Posts
    6,008

    Here's my current fave...

    20/20 is perfect vision!

    Yep......

    barry

  2. #52
    ATO Member HarryChiling's Avatar
    Join Date
    Apr 2005
    Location
    Nowhereville
    Occupation
    Other Eyecare-Related Field
    Posts
    7,765
    Quote Originally Posted by Barry Santini View Post
    20/20 is perfect vision!

    Yep......

    barry
    It should be 26/26 or 8/8 depending on what part of the world your at, and that's still a 12th off.:D (pun intended)
    1st* HTML5 Tracer Software
    1st Mac Compatible Tracer Software
    1st Linux Compatible Tracer Software

    *Dave at OptiVision has a web based tracer integration package that's awesome.

  3. #53
    Banned
    Join Date
    Jun 2000
    Location
    Only City in the World built over a Volcano
    Occupation
    Dispensing Optician
    Posts
    12,996
    Actually I think 20/20 origionally ment that you could resolve the same images and angles (such as E's) as the average marksman in the Crimean War on the British side as measured by Hemholtz.
    Mearly this and nothing more. Some such marksmen saw better than others as all of you know marksmanship has to do with the abilities to estimate the wind, hold the rifle, estimate light, movement, bullet drop, powder load, bullet weight, rain, and a lot of factors as well as sight. Most marksmen (despite being taught to use two) shoot with only one eye, so theoreticly, only the va in the shooting eye would be of importance. If they were all missing the non-shooting eye, it would be irrelevant to the study but it sure would skew the statistics.
    Some would see better or worse that average at 20' but would have some better compensation of the other relevent things to thier shooting skills, especially since these were battlefield marksmen and not target range marksmen.:cheers:

    Chip

  4. #54
    Doh! braheem24's Avatar
    Join Date
    Feb 2001
    Location
    KOCF & 89ft ASL
    Occupation
    Other Eyecare-Related Field
    Posts
    3,843
    There's some days I wish I could give the full moon patients my 20/20 :p

  5. #55
    Master OptiBoarder
    Join Date
    Oct 2004
    Location
    Down in a hole!
    Occupation
    Dispensing Optician
    Posts
    13,078
    Quote Originally Posted by braheem24 View Post
    There's some days I wish I could give the full moon patients my 20/20 :p
    Don't you mean "Red Flag Patients"? ;)

  6. #56
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
    Join Date
    May 2000
    Location
    Seaford, NY USA
    Occupation
    Dispensing Optician
    Posts
    6,008
    Quote Originally Posted by HarryChiling View Post
    It should be 26/26 or 8/8 depending on what part of the world your at, and that's still a 12th off.:D (pun intended)
    luv Harry!

    Barry

  7. #57
    ATO Member HarryChiling's Avatar
    Join Date
    Apr 2005
    Location
    Nowhereville
    Occupation
    Other Eyecare-Related Field
    Posts
    7,765
    Quote Originally Posted by Barry Santini View Post
    luv Harry!

    Barry
    Slow down there Barry I'm a dinner and movie date. ;):D:cheers:
    1st* HTML5 Tracer Software
    1st Mac Compatible Tracer Software
    1st Linux Compatible Tracer Software

    *Dave at OptiVision has a web based tracer integration package that's awesome.

  8. #58
    Master OptiBoarder Alan W's Avatar
    Join Date
    May 2000
    Location
    Seabrook, TX.
    Occupation
    Dispensing Optician
    Posts
    923

    Re: 20/20 as perfect vision

    Ever since I was a "puptician" it was my understanding that 20/20 is not perfect vision, but is normal vision and is further defined as an individual being able to see an object that subtends a 5 degree angle at a distance of 20 feet.
    Perfect vision is as yet undefined but the individual sustains great shock and awe when seeing an object that subtends a 5 degree angle at greater distances than 20 feet, thereby making blind idiots of all his friends except his mother who wanted him to be a doctor!

  9. #59
    ATO Member HarryChiling's Avatar
    Join Date
    Apr 2005
    Location
    Nowhereville
    Occupation
    Other Eyecare-Related Field
    Posts
    7,765
    Quote Originally Posted by Alan W
    individual being able to see an object that subtends a 5 degree angle at a distance of 20 feet.
    Sorta right, it's 5 minutes of arc which is the equivalent of 1/12th of a degree, I made that mitake once myself.
    1st* HTML5 Tracer Software
    1st Mac Compatible Tracer Software
    1st Linux Compatible Tracer Software

    *Dave at OptiVision has a web based tracer integration package that's awesome.

  10. #60
    Master OptiBoarder Darryl Meister's Avatar
    Join Date
    May 2000
    Location
    Kansas City, Kansas, United States
    Occupation
    Lens Manufacturer
    Posts
    3,700
    Visual acuity is ultimately limited by the aberrations of the eye, diffraction, and the density of the photoreceptors of the retina. You are unlikely to ever see visual acuities below 20/12 or 20/15.
    Darryl J. Meister, ABOM

  11. #61
    Banned
    Join Date
    Jun 2000
    Location
    Only City in the World built over a Volcano
    Occupation
    Dispensing Optician
    Posts
    12,996
    Darrell:
    A very high percentage of rigid contact lens (especially PMMA) wearers can see 20/10. I have over the years even had to two that could read the fine print at the bottom of the chart telling where it was printed.
    Had a 10 diopter myope Friday in RGP's see 20/15 + in a poorly lit room with an unilluminated wall chart.

    Chip

  12. #62
    Master OptiBoarder Darryl Meister's Avatar
    Join Date
    May 2000
    Location
    Kansas City, Kansas, United States
    Occupation
    Lens Manufacturer
    Posts
    3,700
    A very high percentage of rigid contact lens (especially PMMA) wearers can see 20/10. I have over the years even had to two that could read the fine print at the bottom of the chart telling where it was printed.
    I don't discount the possibility, particularly with a chart at maximum contrast, absence of significant higher-order ocular aberrations, narrow pupil size, etcetera; but I do discount the likelihood. If you indeed have a "significant" percentage achieving 20/10 visual acuity, which is often quoted as the diffraction limit for a 2 or 3 mm pupil, I would start marketing yourself as a "supervision" provider in your area to compete with those ophthalmologists using wavefront-guided LASIK. ;)
    Last edited by Darryl Meister; 07-23-2007 at 01:18 PM.
    Darryl J. Meister, ABOM

  13. #63
    Master OptiBoarder Alan W's Avatar
    Join Date
    May 2000
    Location
    Seabrook, TX.
    Occupation
    Dispensing Optician
    Posts
    923
    Yeh, thats the ticket!
    Like I said . . . it's been since I was a puptician!
    Thanks.

  14. #64
    What's up? drk's Avatar
    Join Date
    Mar 2004
    Location
    Ohio
    Occupation
    Optometrist
    Posts
    9,388
    20/10 is under 1%, but I agree that RGPs give you a fightin' chance.

    Usually it's some 20-50 y.o. male, in my opinion, that's +0.25.

  15. #65
    Banned
    Join Date
    Jun 2000
    Location
    Only City in the World built over a Volcano
    Occupation
    Dispensing Optician
    Posts
    12,996
    I'd say it's closer to 10+ percent if one is concentious enough to refract over the contacts and change as needed. This is part of what's called "fitting" as opposed to "filling the Rx."
    I have patients with 4 or more diopters of cylinder and 20/10 with contacts. Even have a lot with bifocals (not the norm though) that see 20/10 J-1. What's the big deal. Also note not many of my patients are healthy teenage myopes like they used to be. Seldom did I fail to get at least one line better than spectacles when they were.
    Of course this is undilated acuity.

    Chip

  16. #66
    Something Wicked This WayComes AngryFish's Avatar
    Join Date
    Jun 2007
    Location
    North of 33.75 N 84.39 W -5 GMT 1137'ASL
    Occupation
    Dispensing Optician
    Posts
    296

    I Love This Thread

    "I think the lexical confusion arises... "

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •