and flip-ups are an alternative to prescription sunglasses and can protect
your eyes, improve vision, and increase comfort as well as sunglasses
do. Clip-ons and flip-ups are tinted lenses that fit over prescription
glasses and eliminate the need to switch between regular glasses and
These accessories usually attach to glasses by two or four small clamps: two
reaching over the top of the frame and sometimes two more on the bottom. The quality
of this attachment system is important to prevent scratching your lenses. Neither
the clip nor the tinted lenses themselves should touch the prescription lenses
- this will invariably lead to scratches. Some models are attached by clips
or magnets that don't mar the lenses but may fall off more easily.
frames are sold with matching clip-ons designed for an exact fit. Some
can be purchased through a different manufacturer but may fit your frames
quite well. Custom-made clip-ons are also available. The fit is
critical to protecting your eyeglass lenses from scratches.
Flip-ups are not attached at the bottom. They usually hang from two clips on
the upper part of the frame/lenses, floating freely over the prescription lenses.
A spring system enables the wearer to flip them up when indoors and flip them
down when in bright sunlight. The quality of the spring system is the most important
variable; these clips usually contact the lenses and will scratch them.
and flip-ups come in a variety of materials and with a range of treatments-polycarbonate,
solid tints, mirror coatings, polarized lenses, UV filters, anti-reflective
coatings-just like sunglass lenses.
may be available for some sports eyewear. For example, magnifying lenses
can be used in a flip-up lens for wear by a fisherman when tying flies.
cases are a crucial part of your care regime, for glasses, sunglasses,
clip-ons, and flip-ups - they protect glasses from damage.
be made of hard plastic, soft vinyl, wood, leather, aluminum, cloth
or other materials. Designs range from soft-bodied fabrics with tab
closures and decorative prints, to hard, burnished metals with soft
velour linings and spring hinges. Some designers use exotic covers like
python and ostrich skin. Many optical shops give complimentary cases
with the purchase of eyeglasses.
especially useful for people who frequent workshops, laboratories, construction
zones or industrial areas where flecks of chemicals and glue or wood
shavings can damage unshielded eyeglasses. Of course, in these environments,
wearers need to remove their glasses or sunglasses and wear more appropriate
Boaters and outdoor enthusiasts can purchase crush-resistant cases with waterproof
seals and soft interior padding, some of which even float. Some cases accommodate
wrap-around eyewear. For ease of carry, some cases clip on to your belt or pocket.