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José Feliciano - Light My Fire/Chico And The Man 1975


https://www.youtube.com/watch?v=GLaTXg9t9h8

I've made more than a few pairs of billiard/pool/snooker eyeglasses. Often overlooked under "sports".

Include hobby and shaving eyeglasses somewhere in your scheme.

Robert

Rolling Stones - You Can’t Always Get What You Want 1968


https://www.youtube.com/watch?v=Ef9QnZVpVd8&list=PLKEOCWQDKovctKOmf25SYuykiI6MUv83r& index=5

The compressive and expansive effects are due to minification (minus power) and magnification (plus power), and contribute somewhat to the vertical position of the object, as perceived by the wearer,...

drk,

I think you're yankin' on my trouser leg, that you don't understand the effects of prism on image position.

http://aamerniazi.blogspot.com/2014/01/prism-and-progressive-lenses.html
...

Hard to understand how the refractor head can sit that much closer than the frame. Might be a good idea to refract over the old Rx to see what's what.

Best regards,

Robert Martellaro

Kinks - Shangri-La 2007


https://www.youtube.com/watch?v=bI0QHXTM7Fo

The other way around is true for hyperopes.



https://lensesrx.com/about_prescription_lenses/essilor-ovation-progressive-lenses/

Moreover, the corridor/near point width also needs to be wider...

Jimi Hendrix - Voodoo Child (Slight Return) 1970

In very high definition.


https://www.youtube.com/watch?v=qFfnlYbFEiE

Looks like I picked the wrong week to quit drinking alcohol.

Fairport Convention - Brilliancy Medley 1973


https://www.youtube.com/watch?v=R-xW_BlLXe4

https://www.youtube.com/watch?v=4i8vKiedxqU

Hi Jason,

There's too much image size disparity for spectacle lens wear, about 9%, using the clinical rule of 1% per diopter.

Iseikonic lenses can help, maybe enough to reduce the image size...

I wish you had included existing CL wear in your first post. I was ready to tell your client to call a malpractice lawyer.

There's no binocular solution with spectacle lenses for the above, but...

Right. We don't have the history, but if the fellow eye was inoperable, then leave the right eye at -10 D and call it a day.

Off the record, it sure smells bad though- why write an Rx for...

OS IOL out of pocket.

CL(s).

Min occlusion.

Hope this helps,

Robert Martellaro

Deep Purple - Child in Time 1970


https://www.youtube.com/watch?v=LakSLUaDJWQ

Robert Plant in the first row.

My brother-in-law, a family physician in a small farming community in central Illinois, died two weeks ago from Covid-19. He continued to provide care for his patients to the very end, folks that he...

The only exception I can think of is for incomitant vertical deviations, where the deviation varies with the angle of gaze.

Robert

It's important to note that when determining the degree of VI, prescribed vertical prism should be ignored. In the above scenario, there is less VI at near (and at far) with the proposed new...

drk,

I had my bases reversed- I hope I fixed it before the bots write it in stone.

You're getting a lot more VI than I'm calculating- the power disparity at ninety is only 1.50 D on the new,...

Values rounded slightly.

If 14mm reading depth

Old at 90˚
-4.25
-6.50

VI 1∆ bd rt distance
VI 2.25 bu rt near (less 4mm drop)

Hear, Hear. When the questions go astray and the clock is ticking, I point out what they don't know to get them back on track. If that doesn't work, I break out the bottle from the bottommost drawer...

No kidding. Not to mention my math and notation has been sloppy since the eighties.

Here it is with values entered to make it easier to follow (and grin and bear my notation).

Mono PD 33mm and...

And is that prism due to a vertical phoria, or in response to the vertical prism imbalance generated by the 4mm drop PAL in conjunction with dissimilar powers at 90 degrees?

Us spectacle wearing myopes are accustomed to BI prism when we perform near tasks- one might not want to use the near IPD when designing task lenses. These same folks might have unexpected...