Ace wrote:

"Its known that laser surgury reduces contrast senenstivately. You can
simulate this by being in a brightly lit room then quickly enter a dark

room. You will be nearly blind till your eyes adjust to the dark.
Before they adjust, you can only see the outlines of large objects.
Give it a minute and you start seeing details in large objects and the
outlines of smaller objects. Give it 5 minutes and you see large
objects clearly and lots of details in everything and if your night
vision is very good, you may see faint colors. Laser surgury robs you
of this and gives you what is akin to never adjusting to the dark.
Things are blurry, hazy and what should be shades of gray are almost
entirely black."


Aces latest post is just a summary of what crap comes out of the
"flappie". His next original thought will be his first original
thought.

Its known that laser surgury reduces contrast senenstivately. You can
simulate this by being in a brightly lit room then quickly enter a dark
room. You will be nearly blind till your eyes adjust to the dark.
Before they adjust, you can only see the outlines of large objects.
Give it a minute and you start seeing details in large objects and the
outlines of smaller objects. Give it 5 minutes and you see large
objects clearly and lots of details in everything and if your night
vision is very good, you may see faint colors. Laser surgury robs you
of this and gives you what is akin to never adjusting to the dark.
Things are blurry, hazy and what should be shades of gray are almost
entirely black.

More old Sandy spam. Had to go back to a 1999 tidbit eh? At least
you're not calling Glenn a "friggin" this or that.

Mark A. Bullimore MCOptom PhD, Michael D. Olson OD PhD and Robert K.
Maloney (Oxon) MD, MA b
Accepted 24 Feburary 1999.



Abstract
PURPOSE: To prospectively examine the effect of photorefractive
keratectomy with a 6-mm ablation zone on best-spectacle-corrected
visual performance.
METHODS: A prospective study was conducted of 164 eyes of 164 patients
with an average (±SD) of -4.02 ± 1.74 diopters (range, -0.63 to
-8.38 diopters spherical equivalent). Best-spectacle-corrected
high-contrast and low-contrast visual acuity (18% Weber contrast) was
measured with both natural and dilated pupils. Patients were tested
preoperatively and at 3, 6, and 12 months after photorefractive
keratectomy. Photorefractive keratectomy was performed with an argon
fluoride excimer laser. Fifty-five eyes of 55 patients also underwent
astigmatic keratotomy.

RESULTS: Twelve months after photorefractive keratectomy,
best-spectacle-corrected high-contrast visual acuity with natural
pupils showed no significant change from preoperative values; mean
(±SD) change was 0.004 ± 0.10 logMAR (t = 0.45, P = .65).
Best-spectacle-corrected low-contrast visual acuity with natural pupils
was significantly reduced compared to baseline; mean (±SD) change was
0.04 ± 0.13 logMAR (t = 3.3, P = .001). The low-contrast loss was
larger (1.5 lines) with dilated pupils; mean (±SD) change was 0.13 ±
0.15 logMAR (t = 9.31, P < .001). Greater losses in dilated
low-contrast visual acuity were associated with concurrent astigmatic
keratotomy (t = 2.28, P = .025) and corneal haze of grade 1 or greater
(t = 2.71, P = .005).

CONCLUSIONS: Reductions in visual performance occur after
photorefractive keratectomy with a 6-mm zone. These changes are
greatest for low-contrast visual acuity with dilated pupils. Corneal
haze and concurrent astigmatic keratotomy are associated with greater
losses in low-contrast visual acuity. Best-spectacle-corrected
low-contrast visual acuity is a sensitive measure for evaluating visual
performance after refractive surgery.