High Index with Claris HD - Blurry at night?

[RamseyOpticians]

I have a patient who says she can see well during the day with her 1.67 High Index stock lenses with Claris HD AR on them but says everything is blurry when she wears them at night.
ALL OPINIONS ARE WELCOME!
RX: -5.00 -0.50 180
-5.50 -0.50 002

[newguyaroundhere]

Has the patient ever experienced this before with other pairs of glasses?

[Tallboy]

Is she driving when this happens or its the same when on her front porch? (Dirty windshield)

Otherwise could be night myopia and she needs slightly more minus at night.

I vote dirty windshield.

[Barry Santini]

Put on her glasses and look at a halogen light.

B

[RamseyOpticians]

Has the patient ever experienced this before with other pairs of glasses?

She does not wear glasses on a regular basis. She is an advid contact wearer.

[RamseyOpticians]

She says it is at night when she is driving and I have to say that I have never heard of night myopia.

[newguyaroundhere]

The substance of night myopia is that during nighttime the human eye reacts to the lack of light by dilating its pupil and by slightly moving the focal point before the point of the sharpest vision. Thus the so-called "quarter" myopia is formed. This holds true also for a person who does not suffer from any refractive disorder.

http://www.about-vision.com/refractive-errors/night-myopia-nocturnal-myopia

[edKENdance]

Over minused? How old is she?

[RamseyOpticians]

Over minused? How old is she?

She is a young girl, maybe early 20s

[Tallboy]

Is it a position of wear compensated lens design?

[RamseyOpticians]

No. they are 1.67 high index stock lenses with Claris HD

[Happylady]

I've seen this when the lenses have very fine crazing on them. There is no problem during the day but at night the crazing causes lots of glare and blur.

The crazing is hard to see, you usually need a very good light and magnifying lenses.

[Tallboy]

Happylady makes a great point. That has happened to me before.

[AngeHamm]

Me too. It's very common for the glare and blur from crazing to only be apparent at night (or in a darkened theater, etc.) Take the glasses into a dark room with a single light source and look for crazing.