Non-adapt with Hoya FD (vs GP)

[Pires]

Hi all,

I have a patient here fitted with a new pair of Hoya FD with prescription of:

OD: -4.00/-1.25 X180
OS: -1.75/-1.00 X180
ADD of +2.25

He had been using Hoya GP previously with prescription of:

OD: -3.50/-1.25 X180
OS: -2.25/-1.00 X180
ADD of +1.75

He had been complaining that distance at vision with the new FD was not good, and felt the field of vision was narrow (more distortions seen at the side). he mentioned near vision as fair,but not as good as GP. Overall, he was quite unsatisfied with the FD.

So my question is ,what may have contributed to this patient's problem? I was thinking about the difference hard (GP) and soft (FD) design of the PALs that could have caused his problems. Maybe can someone here shed some light to me, and we can discuss this problem together..

Thanks...

[TLG]

You may have more of a problem with the refraction than the lens. Distance Rx OD dropped from -4.00 to -3.50; unless your patient was overcorrected originally, there's a good chance he/she is missing that extra minus in the right eye. If the Rx is off, all kinds of 'problems' can manifest themselves that will disappear when corrected. Good luck!

[jcamp]

I've seen this with many of the "new" Hoya designs, it's not an Rx change issue.

[TLG]

I've seen this with many of the "new" Hoya designs, it's not an Rx change issue.

You sound so positive yet offer no explanation. What specifically have you "seen"? Is it resolvable? How? And how can you tell by the post that it is NOT an Rx issue?

[Pires]

I had rechecked the Rx of that patient, and the Rx remained same with new Rx. Looking at the Rx comparison with the old Rx (GP), OD Rx increased by -0.50 DS, while OS Rx reduced by -0.50 DS, with ADD increased by +0.50 D.

But I dont think Rx changes of 0.50 D is the main reason behind this... Could it be the anisometropia condition that may be the reason?

[Pires]

What do you mean by 'new' design? Mind to further elaborate?

[Robert Martellaro]

So my question is ,what may have contributed to this patient's problem? I was thinking about the difference hard (GP) and soft (FD) design of the PALs that could have caused his problems. Maybe can someone here shed some light to me, and we can discuss this problem together..

PAL design and the change in Add power are the culprits. The increase in anisometropia doesn't match the symptoms, but should be watched, especially for general fatigue complaints after prolonged near tasks.