Re: Does AR Coating Improve Vision?
- From: Robert Martellaro <robopt@xxxxxxxxxx>
- Date: Tue, 31 Jul 2007 14:00:32 -0500
On Tue, 31 Jul 2007 00:40:58 -0000, stuckingoo@xxxxxxxxx wrote:
On Jul 30, 6:27 pm, Robert Martellaro <rob...@xxxxxxxxxx> wrote:
On Sat, 28 Jul 2007 17:56:09 -0000, stuckin...@xxxxxxxxx wrote:
The frame on my four year old Rodenstock Progressiv glasses recently
busted. My backup was pretty poor so I scurried to get a new
prescription and eyeglasses as soon as I could. I ended up going to
Eyemasters because their turnaround time is so quick. My prescription
only changed with the add (1.25 to 1.75).
Anyway I ended up with the Essilor Ovation Polys. Initially I wanted
the Varilux but they don't stock them, so I went with what is
considered by many, the 'second string' lens. The great thing about
these glasses is that the peripheral vision far surpasses the
Rodenstock.
The bad thing is that the straight ahead view is not
quite as sharp
That's related to Rx, lens design, and lens position, if the object in your
straight ahead view is 20+ feet away. I'd get that resolved to your satisfaction
asap.
Could this have anything to do with the material being polycarbonate
which many seem to feel is optically inferior to plastic or just about
anything else?
Not on the distance gaze, unless the distance Rx is very strong, over eight
diopters or so, and would only occur with PALs or improperly positioned SV
lenses.
Two problems with Poly- it's a very dispersive material and tends to blur images
off-axis in higher strength RXs, and it's very chemical sensitive- tends to
crack at the edges, especially in rimless mountings.
You didn't provide the full Rx in your previous posts, although you did note
that the Add power increased from +1.25 to +1.75. Some folks might feel a
slightly softer focus on the distance gaze initially, along with some flare or
streaking of lights at night, dependant on lens design, pupil diameter, and
client sensitivity. This is much more common, if it happens at all, with higher
Add powers, although there always seems to be exceptions.
However, if you stand up in a relaxed and typical posture, look at a distance
object (a street sign for instance) during the daytime, the object should be
clear and sharp, and should not become clearer if you raise or lower your chin.
Moreover, the distance vision should, at the least, be as clear as your old
glasses. I would investigate further it that's not the case, especially if this
is still occuring the next morning.
Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
Wauwatosa Wi.
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
- Richard Feynman
.
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