Antioxidants
(Vitamin C, Vitamin E,
Beta-carotene, Vitamin A)
Vitamin C, vitamin
E, and beta-carotene are potent
antioxidants that help protect
against free radical damage in the
body and the effects of eye aging. Vitamin A and its precursor,
beta-carotene, are important
antioxidants, which are vital for
normal vision. Vitamin A is
equally essential for the photopigments responsible for
night vision. Vitamin A
supplementation may help prevent
eye disorders caused by vitamin A
deficiency including night
blindness (nyctalopia). [2]
Cataract and
macular degeneration
patients are often deficient in
antioxidants. Studies indicate
that supplementation with vitamins
C, E, and beta-carotene decreases
cataract risk by more than 50
percent, and may help improve
vision. [3,
5] Other studies show
that supplementation with vitamins
C, E, and beta-carotene helps
protect against macular
degeneration. [6,
7] Furthermore, supplementation with
vitamin C may help reduce eye
pressure in glaucoma patients. [8]
Bioflavonoids
(bilberry)
European bilberry (Vaccinium
myrtillus) extract contains a
potent bioflavonoid antioxidant,
anthocyanosides (blue-red pigments
contained in berries). Bilberry
supplementation has been shown to
increase blood flow to the eye,
thereby leading to improvements in vision. Studies suggest
that bilberry supplementation may
help certain eye disorders
including macular degeneration,
cataracts, glaucoma
and diabetic retinopathy. [9,
10]
Zinc
Zinc, a nutritional
mineral, is often low in the
elderly and plays an important
role in retinal function. [11] One study shows that zinc
supplementation may help improve
vision loss in patients with
age-related macular degeneration. [12] Since zinc also regulates the
release of vitamin A, a zinc
deficiency may also adversely affect vision
by inhibiting the release of
vitamin A and its related
compounds.
Selenium and
Glutathione
Cataract patients
have deficiencies in selenium and
selenium-dependent glutathione
peroxidase (GSH-PX), an important
antioxidant enzyme. Lower levels
of glutathione and selenium may
contribute to the development and
progression of cataracts. [13]
Carotenoids (Lutein,
Zeaxanthin, and Lycopene )
Lutein, zeaxanthin,
and lycopene are carotenoid
antioxidants found in the eye.
These nutrients help protect against free radical
damage in the eyes. [14,
15] In
fact, certain studies have found that patients with low
levels of lycopene are twice as
likely to have age-related macular
degeneration.[16]
Another study found that eating a
variety of carotenoid-containing
foods helps protect against AMD. [17]
Grape seed
extract
Grape seed extract
contains a potent bioflavonoid
antioxidant, proanthocyanidins (PCO). Grape seed supplementation may
help protect against free radical
damage and enhance the absorption
of vitamin C. [18]
Grape seed extract supplementation
may be extremely relevant for
ocular health, as it has been
shown to
protect against AMD, improve
poor night vision, and decrease
one's sensitivity
to bright light (photophobia). [19]
Gingko biloba
Gingko biloba
extract contains the potent
bioflavonoid antioxidant, ginkgo flavonglycosides.
Supplementation
with gingko biloba extract may
help improve eye pressure in
glaucoma patients and protect
against AMD and retinopathy. [19]
Melatonin
Melatonin, a
hormone produced by the pineal
gland in the brain, is also an antioxidant
which offers free radical
protection.
Because of this property, melatonin supplementation may
afford some
protection against the formation of
cataracts. [20]
Hachimijiogan
Hachimijiogan, a
Chinese formula containing 8
herbs, has been used to treat
cataracts for centuries. Hachimijiogan supplementation may
confer antioxidant protection in
the eye and help protect against
the formation of cataracts. [21]
Magnesium
Magnesium, a
nutritional mineral, may help
improve eye pressure in glaucoma
patients. One study showed that
magnesium supplementation helped
improve blood supply to the eyes
and assisted with vision of glaucoma patients. [22]
Chromium
Glaucoma patients
are often low in the trace
mineral, chromium. Low
levels of this mineral are associated with high
intraocular pressure and reduced
focusing ability of the eyes. [23]
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