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Astigmatism Question

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lory

New User, Becoming EHEALTHy

Joined: 23 Oct 2007
Posts: 1

Astigmatism Question Posted: 10-23-07 06:27am


hello.I would like to ask a very imp question plz.I'm a person with a plus cylinder astigmatism . I have a power of +0.25 cyl +3 axis 100 BC 8.6 Dia 14.50 (right eye) & power +1 cyl +3 axis 70 BC 8.6 Dia 14.50 (left eye). Can anyone tell me what is an equivalent prescription for this if the cylinder sign is changed to minus. I read on the internet that a prescription of +2+1x120 is equivalent to +3-1x030 but i didn't really get the concept behind it or how it's done so can anyone (preferably a doctor) tell me my exact lens parameters with minus cylinders ?Thanks alot ! Lory

yogahoneybunny

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Joined: 04 Jan 2006
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Location: Strumica, Macedonia

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Posted: 10-25-07 08:29am


Why can't you ask a prescription lens specialist at a specialty store? Are you trying to fill a prescription?

Woodrow

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Joined: 22 Oct 2007
Posts: 22
Location: ,

(not So) Expert Essay Posted: 11-03-07 17:16pm


according to -- Barry Santini, Master Optician and President of Long Island Opticians: http://www. optcorp.com/product.aspx?pid=383-404-6872< /a> I will add the comment that Mr. Santini's "hairspray can" should be visualized as standing upright, as if it were on a bathroom counter top. Thus the vertical axis has flat curvature (i.e., radius at infinity), or "least power," while the horizontal axis has high power, because of the curvature of the can...i.e, short radius. As Mr. Santini describes, the axis of astigmatism would thus be 90 degrees. Zero degrees is horizontal to the left... a departure from conventional graphing convention, as learned in high school algebra trig class, where zero degrees is horizontal to the right. Unfortunately, Mr. Santini does not tell us whether positive 10 degrees is clockwise, or counterclockwise, from horizontal left. Can anyone complete this matter?

Woodrow

New User, Becoming EHEALTHy

Joined: 22 Oct 2007
Posts: 22
Location: ,

Wikipedia Posted: 11-04-07 09:42am


I Googled far and wide for information on astigmatic measurements within eyeglass prescriptions. Amazingly, I could never get an answer to whether axis was measured CW or CCW, from the 9 o'clock position. Wikipedia finally came to the rescue. It's CCW: The Axis is the horizontal, vertical or diagonal angle of the cylindrical correction. The axis is measured in a clock face that starts with zero degrees in the 9 o'clock (or west) direction, and increases through 90 and 180 degrees in a counter-clockwise direction. Your prescription deviates in form from all the examples I have seen on the internet. Look at Wikipedia's example, and post again. What might "BC" mean? I am not an optician or medical professional.

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