Night Vision, Poor

Ability to see at night or in low lighting depends on adaptation in which the pupil of the eye dilates, visual purple increases, and the intensity threshold of the retina is lowered.  A decrease in the oxygen content of the blood (e.g., from cigarette smoke or air pollution) is accompanied by some loss of night vision.  Vitamin A and beta-carotene help to improve night vision.

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About David W. Rowland

David W. Rowland, PhD is a leading edge innovator in the field of natural nutrition, and the creator of the Nutri-Body(R) method of nutritional assessment favored by practitioners. Dr. Rowland is available for telephone consultations. To set up an appointment email:

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