I have astigmatism and had two eyecup lenses made. One is mounted for
horizontal and one for vertical orientation work. /jmac
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx]On
Behalf Of Christopher M
Sent: Sunday, March 14, 2004 2:06 PM
To: Olympus Mailing List
Subject: [OM] Re: Eye relief
At 2004-03-14 11:10, Andrew Dacey wrote:
>Okay sorry about posting something that has been discussed before. I just
>started wearing glasses again so I need to start looking into some eye
>relief with my cameras. I meant to ask my opthamologist about this when I
>was there but didn't get the chance. My prescription is pretty light. I'm
>wondering which set of numbers I use for the diopter correction? It says
>SPH. -1.00 CYL. -0.50 AXIS 10 5 (not sure if it's 105, looks like a space
>between them). Should I get a -1 diopter or -0.5? The place where I get my
>glasses does grind their own lenses and will do custom work for frameless
>glasses so I can probably get them to grind me a lens for an eyecup if I
>wanted to.
The SPH (for spherical) is the dioptre correction you need for
short-sightedness. CYL (for cylindrical) and AXIS are the amount and angle
of correction for astigmatism.
Your optician should be able to grind these corrections for you, although
for astigmatism you'll need to ensure the lens is mounted at the correct
angle. For a rectangular lens this won't be a problem. Fo an eyecup taking
circular lenses you'll need a mark on the lens.
Regards,
Christopher Moss
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