[Lex Computer & Tech Group/LCTG] self measuring eyeglass prescriptions

Sun May 14 22:52:34 PDT 2023

There is a measurement for inter pupillary distance  (P.D.?) that you might have to request from your optometrist and might be different from left to right eye (sometimes they don't get written down).

There is also an app for this, at least on the iPhone.
If ordering online, Warby Parker has the advantage of having retail physical outlets as well, in case the frames need adjustments or something like that. 
-- Bob Primak

    On Sunday, May 14, 2023 at 02:07:51 PM EDT, Steve Isenberg <smisenberg at gmail.com> wrote:  

 Thanks for the details. My intention was to supplement the optometrist visit and not to replace it. I know there are a number of issues that only someone with proper training can detect, monitor, and diagnose and I will continue to visit the professionals annually. 
PD is something you can measure yourself. There are websites with instructions. Basically you hold a ruler with metric markings across your forehead just above your eyes, stare into your webcam at reading distance, and take a photo. Then you do the same as you stare off in the distance. The distance between the center of your pupils in mm are your reading and distance PD values.  Note that I am not an optical professional so don’t take my word or advice as medical advice. 
Cheers,-steve 
On Sun, May 14, 2023 at 1:39 PM S Ou <shukong at gmail.com> wrote:

Hi Steve, I've just recently had my eyes checked and got a new prescription. And oddly I have a few minutes to write a response! 
The lens measurements were a small part of the eye doctor handled - he 1) inspected the cataracts in each eye and was able to characterize them and explain my recent vision issues - the one on my left is small but centered so in bright light with pupils narrowed, the effect of the cataract is worse than in normal or low light when the pupils are more dilated and it's a smaller part of the overall light scenario.2) used a scanner to examine the layers of rods, cones, and other stuff through the back of my retinas, and confirmed that there was a little change but otherwise stable from last year's images and the year before.3) checked for glaucoma and other potential organic issues
What I'm saying is, the eye exam is much more than getting the correct focal length on your lenses.  Even if you got a set to verify your diopter, other issues like astigmatism and other adjustments might be better left to people who went to school for this.  But if there is a kit that does measure all these parameters, that would be cool. The basic elements of a prescription are explained here https://www.perfect-eyeglasses-guide.com/eyeglass-prescription.html 
The final straw is this:  when you order online, for example at https://www.zennioptical.com/  or https://www.39dollarglasses.com/ part of the ordering process is to upload a photo of your prescription.  By the way, there is a measurement for inter pupillary distance  (P.D.?) that you might have to request from your optometrist and might be different from left to right eye (sometimes they don't get written down).
I am now a firm believer that a good eye doctor who has past years records and images of your retina is a valuable baseline to have. Plug here for Winchester Optical (Main St, WInchester) - Dr Deering is thorough and caring.

Best of luck -- I strongly support doing things for ourselves whenever, but your eyes are very important.If you do get a set, that would make a great talk!   In-person double check of your prescription. 

On Sun, May 14, 2023 at 11:14 AM Steve Isenberg <smisenberg at gmail.com> wrote:

Gentlepeople,I’m thinking of getting a optometrist lens set so I can measure my vision and fine tune my eyeglass prescription.  I’m thinking of the old type, where you wear a frame and the doc inserts different lenses, asking is A or B better, etc. 
Any thoughts on what I’m thinking?Do you know of a lens set I could get for free or low price?Have you done or considered doing anything like this yourself?
Thanks,-steve 

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