sunglasses

My syndicate partner I tested several different sunglasses
under a blue Duo canopy a couple of years ago and reported
here on RAS.
We used a variety of different lenses including darker
and lighter tint varieties of Suntigers. We also compared
visibility through haze looking through the clear
view panel and the canopy.

Basically, during flight, the brain adapts and the
blue canopy made no difference to the subjective perception
of colour, which was overwhelmingly that of the sunglass
lens rather than the canopy. Subjectively all of the
different sunglasses seemed to retain their own characteristics
through the blue canopy - the lenses are far stronger
colour filters than the canopy. I never noticed any
perceptible loss of light under a blue canopy and,
counterintuitively, my partner and I both found that
visibility through haze was marginally better looking
through the blue canopy compared with looking through
the open clear view panel.

So I would say choose the colour of lens that you prefer
for other reasons than the colour of the canopy.

Colour photographs through the blue canopy were surprisingly
blue - which shows the difference between a brain and
a camera.

Now that I have a glider with a clear canopy I notice
how much hotter direct sunlight is on me. I never
thought the blue canopy reduced heat build up inside
the cockpit (from the greenhouse effect) but it certainly
reduces direct IR transmission by absorption - which
is why they are blue not amber - and also why the blue
canopies expand more in hot weather.

I hate bifocals in the air and find the transition
line intrusive but progressive lenses are fine for
me.

I can't see that any of the other suggestions in this
thread are going to answer S6's problem as directly
as Scheyden prescripition lense flip ups like I use.
The inner clear prescription lense is fixed and the
outer amber tinted lens flips up when I need to see
in darker areas - both in low light conditions and
also in very bright into-sun conditions when the light
contrast makes LCD screens on the lower part my panel
unreadable to me with dark lenses.

John Galloway



At 16:24 21 January 2006, wrote:
Hi again ,
I forgot one question. No one mention flying with a
tinted coanopy and
the recommended glasses.
Any comment.
S6


wrote:
Hi all,
Thank you for your comment. I will talk with my optician
about
Suntiger, Rayban and Melanin.
Will see what he recommend.
Regards
S6


bumper wrote:
Progressive lenses are not 'progressive bifocals'.
I've been wearing and flying with progressive lenses
for years. Vision is corrected to 20-12. Progressives
do take some getting used to, however they allow distance
vision, close-up reading and everything in between
- like the panel.

Some people cannot adapt to progressives, too bad,
they sure are great if you can!

bumper
Minden NV
'01-- Zero One' wrote in message news:gq2dnWTWkJZ370zeRVn-pw@
comcast.com...
There are some very good reasons not to use progressive
bifocals for flying. Use lined bifocals instead.
This will optimize the visual acuity for what we need.
distance vision (to spot other aircraft, birds, etc.)
and arms length vision (charts, instruments, etc.).



Larry

'01' USA