I remember reading about hard scleral contact lenses that were designed
to reshape the cornea to correct vision. Nowadays scleral lenses have
been developed for all sorts of treatments of eye problems but I think
what I read about back then was concerning the use of the lenses instead
of surgery to correct a misshaped cornea. There is all sorts of
information on the Internet about the amazing work being done with that
type of lens now.
Having worn hard contacts from age 22 until well over 50, I had to
resort to glasses for a number of months before LASIK surgery.
The reason was just what you are saying: my corneas had reshaped
to the inside curve of the hard lenses. Over the 4-5 months, as I
recall, waiting, my eyes were tested monthly and it was only when
there was no month-to-month change did they proceed with the
LASIK. He said my time waiting was unusual and that normally it
was less. With soft contacts, even toric ones, it's just a couple
weeks as I recall.
Of course I now need reading glasses, but the more light the better (blue
eyes) if I'm reading or need to see anything small. I much prefer reading by
halogens than any other light source. Other than fine work and reading, I
prefer it to be rather dark. We rarely have lights on in the house.
I have a Dorcy single-AA very compact flashlight that has 3 low-power
white LEDs, and it has survived some spectacular abuse. However, that
one is switched on/off by a tailcap pushbutton along with some degrees
of screwing/unscrewing of the tailcap overriding the tailcap pushbutton
switch to force the light to be on or off. However, I do find this
flashlight easy to use with one hand due to its small size and its
tailcap pushbutton switch.
Brightness - I find it dimmer than a 2-AA incandescent "Mag" light
having good batteries, but sufficient for most needs of a flashlight.
(I got it in 2008 or 2007, and LEDs have improved after the time that
the ones in this flashlight were manufactured.)
And to add - I found this single-AA Dorcy LED flashlight to be
extremely able to survive extreme abuse. The one that I have, I tossed
to 30 or so feet above pavement, so that it falls 30 or so feet onto
pavement. It survived 15-17 of such toss/falls in a beer-fueled abuse
test. Although this flashlight is "worse for the wear", I still have it
and it still works in all ways that it ever did. I think that it can
survive being run over by a Hummer H2, for that matter even an 18-wheeler
or a loaded concrete mixer truck!
There are now Mag LED 2-AA and 3-AA flashlights. Regrettably, they
lack nice pushbutton switches, but depend on screwing/unscrewing their
heads to switch on and off. I find the 2-AA one to be a bit on the dim
side, but the 3-AA one to be nice-and-bright. (As of a couple years
- Don Klipstein ( firstname.lastname@example.org)
If you look on www.ebay.com you can find some examples of suitable
lights. I've gotten 2 AA light with tailcap push button switch for
about ten bucks. Takes two weeks to arrive from Hong Kong, but
perfectly good light.
The "watt" ratings are over stated. My five watt light draws two
watts, and my three watt single cell light draws about 0.3 watts. Both
perfectly useful lights. The light is slightly blue.
Rechargable cells tend to go dead on their own. They are fine for
applications when you can rotate several through a charger, and into
the unit. For example, pocket digital camera with high drain flash.
For occasional household use, alkalines are the way to go.
Nicads and nickel metal are lower voltage, so the light will be less
You realize that the good LED flashlights are not cheap. Here's the best
one: "http://www.dealextreme.com/details.dx/sku.11343 ".
Some other 2AA good ones:
"http://www.dealextreme.com/details.dx/sku.14909 " (single mode)
"http://www.dealextreme.com/details.dx/sku.15457 " (single mode)
"http://www.dealextreme.com/details.dx/sku.19190 " (6 mode)
While you're correct about AAA batteries, the problem is that it's a lot
easier to make an LED flashlight that operates off around 3.6-4.5V than
it is to make one that operates off 2.4 to 3V, which is why you see so
many 3 AAA flashlights for sale. I.e. Costco sells a two-pack of a very
good Cree LED flashlight for $20. They have two power levels, a strobe,
and an adjustable beam (spot to flood). But they are AAA powered.
Costco also has some good C cell powered Cree LED flashlights,
The problem with LED flashlights is that most of them suck. The
manufacturer puts in a very low quality, low power, LED (or a bunch of
crappy LEDs) and sells the thing for $5 (or in the case of Harbor
Freight Tools, even less), but it has a crappy lens and reflector along
with the crappy LED. There are some excellent LED flashlights, but the
high power comes at a price both in initial cost and in battery life.
I'm gonna cut the heads off about three of the HF flashlights, attach them
to a track and hook up a 4.5v wall-wart to see if I can't make an economical
under-cabinet counter light.
Maybe I can replace the flashlight switch with a magnetic switch to turn on
the flashlight when the closet door opens.
We have potential here...
Might need a current limiting resistor. I've not done much work with
LED. I'm told that when they heat up, the internal resistance drops to
near zero. So, running on D cells will over amp them. The small
batteries aren't an issue, the small batteries can't put out enough
amps to damage.
Like I say, I've not tried this. But some internet research will help.
I love the idea of making under counter lights, or area lights. I also
like the idea of make one on three D cells side to side, and use as a
night light for power cuts.
Puhleeze! You are feeding my compulsion to drag out of the car and beat the
shit out of people with obnoxiously bright headlights. Or those who drive
with fog lights on and 50 mile visibility.
You'll probably read about me someday in the newspaper, or on the Internet,
most likely, as newspapers are dying.
Is this like penis envy? HEY, LOOK AT THIS! YOU CAN'T GET AWAY! LOOK!
visit my blog at http://cabgbypasssurgery.com
I don't know about "good" but I was in Home Depot a few days ago and
they had large cards with 15 or 18 of the LED flashlights and
batteries for all for about $15 to $18 (worked out @ $1 each). Plenty
of spares or Christmas stocking stuffers.
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