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发帖数: 17993 | 1 REI的这篇文章挺好，针对滑雪Goggle的选择，我转贴过来：
http://www.rei.com/learn/expert-advice/goggles.html
Goggles for Skiing and Snowboard: How to Choose
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Goggles offer you better eye protection than sunglasses do when you're
snowboarding or skiing for the day.
At first glance, it may not be apparent why goggles range so widely in price
—from $25 to over $200. Here's how to make sense of the technology and find
the right pair for your needs.
Why Wear Goggles?
The superior coverage offered by goggles versus sunglasses protects you from
a number of on-the-mountain hazards:
At high altitudes, the air is thinner and filters less ultraviolet (UV)
rays.
The sun's reflection on snow is brighter and more intense.
Wind can make your eyes tear and blur your vision.
Ice particles can get into your eyes, especially when descending fast.
Twigs and branches can hit your eyes when dropping through the trees.
Shop REI's selection of ski goggles or snowboard goggles.
Goggles by Price Range
Here are the features you can typically expect at various price ranges:
Under $50 $50 to $100 $100 & more
UV protection 100% 100% 100%
Helmet compatible Yes Yes Yes
Eyewear compatible No Some Some
Gender Unisex only Women's and unisex Women's and unisex
Lens shape Flat Flat or spherical Mostly spherical
Lens type Single or double Double Double
Mirrored lenses No Yes Yes
Polarized lenses No Yes Yes
Photochromic lenses No No Some
Interchangeable lenses No Some Some
Venting ability Fair Good to excellent Excellent
Frame padding Double Triple Triple
Strap adjustment Clip Clip; some with buckle Clip and buckle
How important are each of these features? Let's take a closer look.
Lenses and Ventilation
The quality and features built into lenses represent the biggest difference
between basic and high-end goggles.
Lens Shape
There are 2 common lens shapes: flat and spherical. REI lists this
information in the product specs on REI.com. Be aware though that some
manufacturers use proprietary terms on their own websites to describe these
2 basic shapes.
Flat. The lens curves left-to-right across your eyes and face, but the
lens surface is vertically flat (between the nose and forehead). Flat-lensed
goggles are priced lower and work fine, but the flatness can cause more
glare and slightly reduces peripheral vision.
Spherical. This lens, too, curves across your eyes and face, but it also
curves vertically. Curved spherical lenses give better peripheral vision,
less distortion and less glare but their cost is higher.
How to Avoid Fogging
When warm air (your body heat) meets cold air (the outside temperature),
condensation can form. Goggles use a variety of approaches that can help you
avoid fogging.
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Double lenses: These are used nearly universally since they do not fog as
fast as single-layered lenses. Sealed properly, they create a thermal
barrier (like storm windows) that is even more resistant to fogging. An anti
-fog coating will help any lens to ward off fogging.
Anti-fog coatings: These are integrated into virtually all mid-level to high
-end goggle lenses to help deter fogging.
Vents: The top, sides and bottom of goggles are the keys to help control
fogging. Wider vents generally create better ventilating airflow than
smaller venting holes. The trade-off is that it means your face may get cold
, particularly in extreme climates.
Fans: A few high-end goggles include small, battery-operated fans to help
disperse moisture. Fans with different settings can be adjusted for standing
in a lift line, riding the gondola or going down the slope.
Tip: If you're not wearing a helmet, don't put your goggles on top of your
head. Rising heat from your body escapes through your head and cap, and
goggles sitting on a head will trap this moisture.
Anti-fog products: These can be used on lower-end goggles without a coating
or old goggles that are starting to fog.
An anti-fog solution can be applied to the lens before hitting the slope
. Just let it dry and you're ready.
A fog cloth is a soft, lint-free cloth with inhibitors that help deter
fog on the lenses and removes smudges.
A fog eraser is a sponge on one side to blot and absorb moisture, and a
soft chamois on the other side to dry a goggle lens.
Tip: Wiping snow off of your goggles can actually lead to more moisture and
fog, plus scratch the lenses. To avoid scratches, use the goggle sack or a
lens-specific cloth to blot (not wipe) any moisture off of the lens.
UV Protection
There are 3 types of ultraviolet (UV) rays—UVA, UVB and UVC. A lens rated
for 100% UV protection protects you from all of them. This has become the
standard on virtually all goggles sold today. Remember, even when it's
cloudy, UV rays are bouncing off of the snow.
Selecting a Lens Color
Standard Lenses
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Note: VLT (visible light transmission) figures provided by goggle
manufacturers.
Your lens color serves to filter and emphasize the colors in your vision.
Goggles are offered in a variety of popular colors. In addition, some
goggles have photochromic lenses that adjust to different light conditions.
Other goggles provide interchangeable lenses so you can swap out different
colored lenses for changing light situations.
The amount of light that reaches your eyes through the lens is called the
visible light transmission (VLT). This spec is determined by the lens tint.
Lighter lenses have a higher transmission and percentage where more
light passes through the lenses.
Darker lenses have lower light transmission and percentage where less
light passes through the lenses.
Lens Features
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Mirroring: Mirrored lenses have a partial or full lens coating on the
outside of the outer lens. This reflects more light and thus allows in less
light (by between 10% and 50%) than non-mirrored goggles. They're like a one
-way mirror where you can look out, but no one can see into your eyes
Polarizing: A polarizing filter's primary function is to reduce glare from
sunlight on snow or water.
/Polarizing%20color%20lenses.jpg
Note: VLT (visible light transmission) figures provided by goggle
manufacturers.
Photochromic: These lenses automatically change their tint level according
to conditions and UV intensity. The more sun and UV rays, the darker the
lenses become. If it's snowing or overcast the lens stays lighter. Indoors,
they always stay light no matter the light intensity.
/Photochromic%20color%20lenses.jpg
Note: VLT (visible light transmission) figures provided by goggle
manufacturers.
Goggle Frames and Fit
Make sure to get goggles that fit your face. Manufacturers' sizing varies;
some models are best suited for smaller or larger faces. Women's and kids'
sizes are offered in some models, too. Check the online product description
for this information.
Most frames are made of polyurethane because it allows for some flexibility.
In general, a more flexible frame is best for harsh use and cold
temperatures. Again, the online product description will often give clues
about a frame's flexibility.
Other fit considerations:
Helmet: Virtually all goggles are compatible with helmets, but it's
always a good idea to try on the goggles with your helmet to ensure a
comfortable fit. For more on helmets, see the REI Expert Advice article, How
to Choose a Snow Helmet.
Strap adjustments: Make sure goggle straps adjust to fit around your
head and helmet. Most goggles have a single, sliding clip to make
adjustments. Others may have an open/close buckle with sliding clips on each
side for adjustments. Some children's goggle straps have no adjustments at
all.
Padding: Foam padding keeps the goggle from pinching your face. It
should be thick enough to cushion your face and seal out the elements but
not be so thick that it promotes fogging. Higher-end goggles may use 2 or 3
layers of thin padding to create better venting.
Peripheral vision: In general, a spherical lens offers better peripheral
vision than a flat lens, and the larger the lens the better your peripheral
vision becomes.
Fit: The fit should not be tight, but snug and comfortable.
Goggles and your glasses: If you wear prescription glasses, look for
goggles that are designed to fit over your glasses, often referred to as OTG
(Over the Glass) styles. These have extra space to accommodate the glasses
while avoiding pressure on your face from the temples and nosepiece.
Tip: You can also use an anti-fog treatment on your eyeglasses to help keep
them clear under the goggles.
Shop REI's selection of ski goggles or snowboard goggles.
Goggle Care
Avoiding Scratches
Goggles are pretty durable, but the lenses require some thought and care to
maximize their usefulness.
First, get a pair that has at least 1 scratch-resistant coating—2
coatings are even better.
Keep the goggles in a soft-lined sack when you're not wearing them.
Don't set the lenses lens-side down on a table or hard surface.
Don't leave them on a heater or vehicle dashboard.
Don't store them in sunlight.
Scratches usually are not covered under warranty, but some manufacturers do
have replacement lenses you can purchase.
Cleaning
Check your instruction manual before cleaning—some common cleaners can
damage lenses. Use a recommended cleaner and a very soft cloth—paper
products and ski gloves can make scratches. Try to keep fingers and
fingerprints off of the lenses to avoid oil, dirt and smudges. Most goggle
storage sacks double as a cleaning cloth.
To clean:
Shake off excess snow.
Clear snow off of vents.
Let any remaining snow melt.
Use a soft cloth or anti-fog cloth to blot (not wipe) the lens dry.
Put goggle back on and keep moving. Airflow will help the goggle stay
dry.
Storage When Not in Use
When not wearing your goggles on the mountain, putting the goggles in a
pocket will keep them dry and ready for use. But be sure to use an exterior
pocket—an interior pocket, where there is body heat, can fog them. Make
sure there is nothing in the pocket that could scratch them, including the
pocket fabric. Be sure to use the storage bag.
Goggle FAQs
Q: Do ski goggles and snowboard goggles offer basically the same function
and protection?
A: Yes, the differences are mainly cosmetic and reflect each brand's style
and personality.
Q: What lens colors are best for bright, sunny days?
A: Brown, gray and copper-colored lenses all allow reduced VLT (visible
light transmission) and thus excel on blue-sky days.
Q: What lens colors should I consider for snowy or overcast days?
A: Yellow, gold, amber, green or rose-colored lenses all offer increased VLT
(visible light transmission) and make good choices on days with poor
visibility days.
Q: What lens color should I use for night skiing?
A: Go with goggles that offer a clear lens option. | q*c
发帖数: 17993 | 2 关于滑雪Goggle的基本问题，这篇文章里几乎都有提到了 |
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