Patient with -4.50 cyl.

[phillipk]

Cust/Patient says when he looks through the peripheral in the SV lenses I made him in poly. He notices bluriness and says they are not quite right when even looking forward. Getting a 3d effect when reading distant lettering. Dr. changed axis in left eye by 5. So will redo in either plastic or hi ind. But because of the low abbe of poly if that had anything to do with the peripheral being blurred?

O.D. -.50 -2.25 x 92
O.S. Pl -4.50 x 83

Any suggestions on remedying this?

Thanks:(

[chip anderson]

Never do poly if cyl over 2.50. If you do make sure vertical as well as horizontal centers are exact. Preferably never do poly. But if you do use it only in little small Rx's where chromatic distortion is minimal.
Remedy: Anything would be better. Glass being best, CR39 next, some sort of high index aspheric probably next.

Chip

[steff]

Back to the doc for a recheck.

4.50 cyl, 5 degrees.... blurriness looking forward = alarm bells.

I say don't redo before a recheck, if not I reckon you might be eating 2 sets of lenses, instead of just one.

steff

[Optician Magician]

What is the eyesize? You might try a smaller frame to minimize the problem. Make sure OC/PD's are exact. What material was the pt. wearing previously?

[braheem24]

Twist it back 5 degrees, if it dont work remake in Hi-index.

[Jacqui]

Your first mistake was using poly, never use poly :finger:. Try CR-39 or Trivex instead, glass is even better :D. Aspheric may also help.

[MarcE]

Is high-index much better than poly for aberations? Not really.
At that high cyl, and a history of problems, I wouldn't chance 1.67. 1.60 would be better if talking about high index.

[FullCircle]

What was the prior Rx? What material were they wearing? Regular poly or aspheric?

What about frame alignment? I recently had a woman come in, decent amount of cyl, Rx changed only by .25. Got her new glasses and couldn't see. I asked to see her old glases and sure enough, the old glasses had been bent so much that she had changed her axis by at least 10 degrees. I explained the situation, told her to try the new ones the following day with fresh eyes and come back if things didn't improve. She came back, only to say that things went great

[phillipk]

Don't know what material he wore before, but I am leaning towards using plastic. Plastic Paul Frank frame, 54-15, B 31. I don't think weight/thickness is an issue with him. He also said that tilting the frame, things would come into focus better.The RX was already redone. Axis on the O.S. was 88. Dr. changed axis to 83 and specified mono pd on left to 33 which I measured 33.5 with my pupilometer. Just concerned he will have the same problem with Hi Index material. Just changed from Hi Index to plastic with lab. The lab will waive the redo.


Thanks for all the input, Phillip

[HarryChiling]

CR-39, Mid-Index, or Trivex will help with chromatic aberation which can cause blur especially in higher cyls and powers.

[odosou]

I would try to match base curve of old lenses as well. Have had a couple of cases where almost no Rx change similar frame but drastically different base curve gave the patient fits, so on high cyls I specify base curve now.

[GOS_Queen]

That is pretty much my personal Rx (yes, you all probably figured I was a pointy eyed freak :p) ...

I have worn most materials with no problem.

I do personally like to have the frame alignment a certain way and will match all my glasses to "the" perfect fit as far as panto and wrap (perfect in MY opinion...) ;)

I will sometimes notice a change in base curves, lens materials, or vertex when I get a new pair but that usually goes away within 24 hours.

I really hope that this person is wearing an A/R coating - truthfully, I'll never be without it! It is VITAL, in my opinion, for someone with significant cylinder correction.