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Reviews > Eye Protection and Binoculars > Sun Glasses > Dual Eyewear Bifocal Sunglasses > Test Report by Kurt Papke
|Height:||6' 4" (193 cm)|
|Weight:||235 lbs (107 kg)|
|Email address:||kwpapke at gmail dot com|
|City, State, Country:||Tucson, Arizona USA|
|Manufacturer:||Dual Eyewear LLC|
|Year of manufacture:||2012|
||US $ 49.95
gray (color tested)
Brown also available
black with red temple tips.
one size available (medium - large)
oz (27 g), 1.23 oz (35 g) with carrying pouch
No measurements (including weight) were available on the website or supplied packaging & labeling
||+1.5 (tested), 2.0 and 2.5 also available
|UV spectrum coverage:
||100% UVA, UVB, UVC|
The sunglasses came in a nice soft
carrying pouch - I have found from prior experience with similar
pouches that these really keep the lenses from getting scratched
when the glasses are slopping around in my hiking pants.
I tried them on. They seem to fit me
pretty well, no real pressure on the temples and they rest
nicely my nose. Coverage of my field of vision was
excellent: it didn't seem like any direct sunlight was likely to
get in my eyes.
When I looked through the lens, the
diopter effect was very apparent. I did notice a slight
blur line at the break between the flat lens and the top of the
close-up area. I tried to get a picture of this as shown
above - the green arrow points to the blur line.
The manufacturer's website recommends
backing off 0.5 diopters from what one normally uses for
reading, as many outdoor uses are at a slightly longer distance,
e.g. reading a speedometer. I followed their
recommendations. Indeed, they are a little blurry for
close up reading, but work well for material that is arm's
length. I'll see how this pans out for backpacking.
I always have two problems with
||Terrain/ trail type
|Feb 24-26, 2012||Organ Pipe National Monument, and Cabeza Prieta National Wildlife Refuge near Ajo, AZ||Charlie Bell
|Basalt and granite rock fragments on a Jeep trail||Sunny, 50-80 F
|March 30-April 1, 2012
||Catalina Mountains in the Coronado National
Forest near Tucson, Arizona
|Desert valley to high mountain canyons
|April 20-22, 2012||Rincon Mountains in Saguaro National Park near Tucson, Arizona||Miller/
|Sky Island ridgelines: from rocky desert canyons to Ponderosa Pine woodlands||40-95 F
This was a
three-day/two night backpacking trip. I have day hiked the
lower sections of Romero Canyon many times, but never done an
overnight there. It is the closest backpacking trailhead
from my home, just 15 minutes away, and I just wanted to get into
the backcountry without doing much driving. In addition to
the Romero trail itself, I hiked up to Romero Pass and did a short
section of the Arizona Trail south to the Cathedral Rock trail.
The sunshine was brilliant so I wore the duals all the time I was
on the trail Friday and Saturday. Saturday was supposed to
come close to breaking a record for high temperatures, so even
though I was at some altitude I was sweating profusely, and had to
stop frequently to wipe the sweat off the sunglasses.
The Duals performed very well, allowing me to read my GPS,
wristwatch, and maps without digging out my reading glasses.
The focus issues on descents continued to be distracting for me,
so I did not wear them on the hike out on Sunday morning as it was
all downhill and the sun was at my back.
The picture at left is an unflattering image of me wearing the
Dual glasses on the trail. I had just completed a section of
the Cathedral Rock trail which was very steep, and I was
still panting, hence my mouth gaping wide open on the photo.
This hike is a popular traverse of the Eastern slopes of the Rincon Mountains of Saguaro National Park that had been on my radar for some time. My ascent on Friday afternoon was on the shadow side of the mountains, so that didn't stress the Duals very much. The descent on Sunday morning was another matter as I was staring right into the desert mountain sun at pretty good altitude. The following picture shows one of my biggest struggles with sunglasses: sweat dripping down the lenses:
The Dual Sunglasses are fabulous for driving and bicycling.
They work well for me on even or ascending terrain, less well on
long descents where I have to look down through the correction
part of the bifocals to see the trail.
The week of
April 30 I headed to Minneapolis, Minnesota, and from there to
Lucerne, Switzerland. The Duals came along for the
ride. I used them when driving, on the train in Switzerland,
and during the occasional stroll.
The photo at left shows the glasses in action on the shores of Lake Lucerne with Mount Pilatus in the background. I wish I could have gotten out and done a little hiking in the Alps, but that was not possible on this business trip.
May 7, I put the Duals into my shirt pocket to walk out of the
office and to my car. Snap! The left temple tips broke
at precisely the same spot as the right ones. Fortunately
when the first ones broke Customer Service sent me a complete set,
so I have a spare. I'm thinking about not trying to wear
these every single day as I have been, they just seem too
fragile. Perhaps I should reserve them for bicycling and
||Terrain/ trail type
|May 28, 2012||Coronado National Forest, Santa Catalina Mountains||Finger Rock
|Very steep high desert canyon||Sunny, 62-84F (17-29 C), 7-15% RH||3100-5465 ft
|June 21-23, 2012||San Francisco Peaks in the Coconino National Forest near Flagstaff, Arizona||Mt Humphreys
|Forests to mountain peak tundra||Sunny, 50-80 F
This was a morning conditioning day hike up one of the most
challenging canyons in the Tucson area. I was working hard
enough on the ascent that sweat from my face was constantly
dripping into and running down the glasses. This happens to
me with every pair I have worn -- someday I hope a company will
come up with a design or technology that actually prevents
this. Other than that, the sunglasses worked just
fine. I think I am finally getting used to the bifocals
during descents, as it didn't seem to bother me quite as much on
this hike despite the steep terrain.
This was a 3-day 2-night backpacking
loop hike consisting of the Kachina, Mt Humphreys and
Weatherford trails in the San Francisco Peaks, including a
summit of Mt Humphreys. We were hiking at pretty good
altitude, so a protective pair of sunglasses were very important
to me on this trip.
The photo at left shows the Duals in action on the Weatherford
trail. About 2 hours earlier we were at the peak of the
mountain in the background, where the glasses did a great job of
protecting my eyes from the fierce sunlight at that
altitude. I continue to like the tint and clarity of these
On the way down the mountain the Dual lenses did not bother me
as much as some prior hikes, despite the higher
magnification. I think it is because the descent trail is
an old roadbed, so it was a very gentle grade with few of the
big "steps" that I am used to having to navigate in the canyons
I often hike. I didn't have to focus so much on foot
placement, so I was able to look up more out of the
non-corrective part of the lenses.
During the 5-hour drive home from the trail I wore the Duals in
the car. Contrary to my prior experience, with the higher
magnification the dashboard was too far away and was blurry when
looking through the corrective lens. I certainly concur
with the recommendation from the Dual website to go with
under-correction when selecting the diopter.
I like the ability to see my watch, GPS or camera screen when
on the trail with the Dual sunglasses, but I have lost all
confidence in their durability. When I am packing in the
backcountry my sunglasses are an essential element of my kit,
and I cannot afford to be unable to wear them due to breakage.
I think the Dual glasses are an excellent choice when cycling
and driving, and I will continue to use them for that purpose
despite the lens correction being too strong with the
I do concur with the advice on their website to select a lens
strength slightly lower than used for reading -- it makes a huge
difference when staring at the ground, or even when looking at
the dashboard of my car.