Insights & Discussion
Goji berry supplementation can improve macular pigment and visual acuity in patients with early age-related macular degeneration by increasing serum zeaxanthin levels.
In this prospective, randomized controlled study, 114 patients, aged 51 to 92 and with early age-related macular degeneration, were divided into two groups. One group was given a daily supplementation of 25 grams of Goji berries for 90 days while the control group continued with their normal diet. The study used Heterochromatic Flicker Photometry to measure the Macular Pigment Optical Density (MPOD) and High-Performance Liquid Chromatography to analyze the levels of serum lutein and zeaxanthin. These were recorded at the beginning and at the end of the study.
In the Goji berry group, by the end of the study, there was no significant change in serum lutein levels. However, there was an increase in serum zeaxanthin levels which coincided with the group's improvement in MPOD. In comparison to the control group, the Goji group had higher zeaxanthin levels and MPOD. The visual acuity of the Goji berry group also showed a relative decrease compared to the baseline. These results suggest Goji berry supplementation can beneficially impact early age-related macular degeneration patients by boosting serum zeaxanthin levels, thus raising MPOD and improving visual acuity.
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A botanical formula of lutein ester, zeaxanthin, and extracts from blackcurrant, chrysanthemum, and goji berry can effectively lessen eye fatigue and improve macular function.
2020 The American Journal of Clinical Nutrition A novel botanical formula improves eye fatigue and dry eye: a randomized, double-blind, placebo-controlled study Kan J, Wang M, Liu Y, Liu H, Chen L, Zhang X, et al.
Randomised Controlled Trial Blackcurrant Chrysanthemum Dry Eye
Research methodology involved the distribution of 360 randomly selected participants into four groups where they received placebos and three varied doses of a botanical formula. This formula, given in chewable tablets comprised of 6 mg, 10 mg, or 14 mg of lutein. Each participant was administered these once daily over a period of 90 days, and had three check-ins at the beginning, at day 45, and finally on day 90 of the study.
The results of the study indicated that the botanical formula effectively improved the individual scores of participants on eye fatigue symptoms like eye soreness, blurred vision, dry eyes, foreign body sensation, and tearing. Using the formula resulted in a notable decrease in the total score of eye fatigue symptoms at both the 45-day and 90-day intervals as compared to the placebo while also significantly improving visuognosis persistence time. Tear secretion improvement was observed in the groups having 10mg and 14mg lutein formula, supported by the Schirmer test. Furthermore, the results showed an increase in macular pigment optical density with all three doses of the formula, but no significant alterations were observed in the retinal thickness and retinal volume among all the groups at both check-ins.
Daily goji berry supplementation increases antioxidant levels and protects visual health in the elderly, though the exact mechanism remains unclear.
2011 Optometry and Vision Science Goji Berry Effects on Macular Characteristics and Plasma Antioxidant Levels Bucheli P, Vidal K, Shen L, Gu Z, Zhang C, Miller LE, et al.
Randomised Controlled Trial Antioxidant Eye Health Goji Berry
In a double-masked, randomized, placebo-controlled study, elderly participants were given either a milk-based goji berry supplement (13.7 g/d) or a placebo for a 90-day period. Eye health was assessed via direct examination to measure pigmentation and soft drusen count in the macula, and blood tests were done to determine plasma zeaxanthin level and total antioxidant capacity.
In the discussion of results, the placebo group showed signs of hypopigmentation and soft drusen accumulation in the macula, which did not occur in the group that received the goji berry supplement. The group supplementing with goji berries also showed a significant increase in plasma zeaxanthin levels and total antioxidant capacity, while no change was seen in the placebo group. There were no adverse effects of the supplement reported in either group.