Nikon Seemax 1.60 single vision

[Dr Kenny]

R-5.75/+2.25x100
L-5.50/+1.50x100

I have a px wearing the above rx in Nikon Seemax 1.60 sv.

The right lens gives him perfect vision, however he has a complaint with the left:
Straight ahead; perfect
Looking to the nasal; perfect
Looking to the temple; he gets what he describes as a line or band on the lens where the vision is not clear. When he gets past this 'band' and into the periphery sharpness returns.

I have checked and double checked everything: rx, centration, compared to previous rx & centration, fit, panto, apical, taken v-values into account. I'm stumped. Sounds almost like a ring scotoma from an old lenticular but it couldn't be that.

Any suggestions??

[chip anderson]

Have you tried holding the lens at arms length and looking at a distant tube light. Rotate, twist, wiggle, bet there is some abberration there.
A colmascope might also reveal some stress in the lens.

Chip

[Jacqui]

I was thinking maybe a bad lens.

[Crazy-bout-Optics]

The only time I have encountered this, there was peripheral blur on both lenses. I'e only noticed this with Aspheric lenses that were either fit wrong, or the pt does not tolerate the change in base curve. Pts with + Rx's seem to have no problem, but those moderate myopes out there are the ones I run into trouble with. Have Pd's changed form previous pair? I am sure you've checked everything. Either Pt cannot tolerate an Aspheric lens in the OS, or its a bad lens. If the last lenses were Aspheric, I'd say its a bad lens.

~Crazy

[chip anderson]

Doan "bad lens" translate "aberrated?"

[sharpstick777]

Could also be a coating flaw... I have had a few that I could not see unless the lens was held at the correct distance and at the correct angle. With some of the A/R's with over 45 layers it only takes one mess up to create a "ripple" in the lens.

Just redo it...

Sharpstick