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Since I seem to have this problem recently, that seems to lead to unexplained damage to eyeglasses....I thought I should acquire some cheap spares. Like using offers that appear via deals.woot.com or such sites now and then.
But, I had a bad experience before, because my PD wasn't right.
Now, I had noticed that there was a different PD measurement listed on my prescriptions that I've been getting from Eyecare Associates....which are probably right, but I thought I should see if there was some way to check for myself.
Searching the Internet, I found these instructions.
Self measure PD in front of a mirror: you need a mirror and a MM ruler.
- Stand with you face about 20 cm (8 inches) from the mirror.
- Close your right eye and look only with your left eye.
- Place a ruler flat against the mirror and align it horizontally with the millimeter scale pointing up.
- Look over the top of the ruler and align the zero mark in the center of your left pupil.
- Open your right eye and close the left, but do not move your face or the ruler.
- Read the millimeter measurement corresponding to the center of your right pupil.
- Repeat the procedure several times to make sure you have a consistent measurement.
But this is rather difficult....well, there's another procedure:
- Hold the mm ruler on the bridge of your nose for stability. Pretend you can look through the mirror (X-ray vision) to see the horizon far away. This keeps your eyes from rotating in toward your nose.
- Point your face [nose] straight into a mirror.
--- CLOSE your left eye to avoid parallax error. ---
- Align the ruler's zero to the center of your right pupil. The pupil is the black spot in the middle of the eye.
- Without moving the ruler, close your right eye and open your left eye.
- Read the millimeter line under your left pupil (careful -- backwards in mirror!).
--- Keep you face "square" to the mirror to avoid parallax error. ---
- Repeat two or three times to confirm accuracy.
Using this second procedure, seems to confirm the PD on record for my prescription from Eyecare Associates.
That's kind of a big difference than the number entered at Lenscrafters (62mm). Probably explains why buying glasses from anywhere other than Lenscrafters had always been a disaster. Which they don't use in the store, rather marking PD locations on the demo lenses and making the pair from that....within an hour.
Time to see if a few $9 pairs will really work....well, they'll end up much more than that, because I'll add in things like anti-scratch, anti-glare, high-index and progressive....and maybe I'll tint one.
Latest Poopli Updaters -- http://lkc.me/poop
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