Educational information, not medical advice — ask your doctor or midwife.
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Shi Hu Ye Guang Wan, also called Dendrobium Pill for Night Vision, is a traditional Chinese herbal pill taken for tired, dry, blurry eyes. It is a single finished medicine (a TCM formula) sold as small pills, though the recipe blends more than twenty herbs, seeds and shells.
It is used in Chinese medicine for eyes that feel gritty or dry, for blurred or dim vision, for night-time vision trouble, and in the early stages of clouding of the lens (cataract). Practitioners pick it for people they see as having "yin deficiency" with heat rising to the eyes.
The honest verdict: the traditional record is long and consistent, but good human trial evidence is thin, and what exists is small and poorly reported. Long traditional use is not proof that a remedy works — that point applies to everything below and is not repeated in each section.
In Chinese medicine terms, the formula is said to nourish the liver and kidney, moisten dryness, clear heat and "brighten the eyes". Those are traditional ideas, not measured biology.
In modern terms, several ingredients contain antioxidant plant compounds, and lab studies suggest some may reduce oxidative stress (chemical damage to cells) in eye tissue. Wolfberry supplies carotenoids that the retina uses.
None of this has been shown to change vision in a well-run human trial. Treat the mechanism as a plausible idea, not a demonstrated effect.
Most often sold as small round "water-honey" pills or larger honey pills in a jar or wax ball.
Other forms you may see:
Concentrated pills or tablets from patent-medicine makers. Loose raw herbs, weighed by a practitioner and boiled into a decoction (a strong tea). Granules that dissolve in hot water.
Buy only from suppliers who test each batch for heavy metals such as lead and mercury, for pesticides, and for hidden added drugs. Imported herbal pills have failed such tests in the past.
The formula is recorded in Chinese medical texts from around the Yuan and Ming periods, roughly the 14th to 17th centuries, and is usually traced to Yuan Ji Qi Wei (1345).
It has stayed in continuous use as a standard eye formula and appears in the modern Chinese Pharmacopoeia as a manufactured patent medicine. Its standing rests on one tradition, Chinese medicine, rather than on several separate ones.
See a doctor or optometrist promptly if your vision suddenly blurs, dims or goes dark, if you see flashes or a shower of floaters, or if an eye becomes red and painful.
Stop the pills and contact your doctor if your ankles or face swell, you gain weight quickly, your blood pressure rises, or you feel muscle weakness, bad cramps, a thumping or irregular heartbeat, or unusual tiredness. These can be signs of the licorice effect.
Get emergency help for a severe allergic reaction: swelling of the lips or tongue, trouble breathing, or a spreading rash.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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