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Visual Acuity

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Summary of Visual Acuity

Scientific Information on Visual Acuity

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Human Effect Matrix

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The Human Effect Matrix looks at human studies to tell you what supplements affect Visual Acuity.

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Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Supplement Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
Notes
grade-c Minor - See study
Improvements have been noted in the visual field in persons with normal tension glaucoma, which is characterized by damage to this parameter. It is uncertain whether ginkgo increases visual acuity in otherwise healthy persons.
grade-c Minor Very High See 2 studies
Supplementation of saffron appears to increase visual acuity in persons with age-related macular degeneration.
grade-c - - See study
No significant influence on visual acuity has been noted with caffeine on hand-eye or target-based visual tasks

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