I would like to learn about the role of DHA in preventing myopia and the correct method of administration, including how many capsules to take per day and whether long-term use is advisable.

DHA is an Omega-3 fatty acid that is crucial for the normal function of the retina. It is a key component of retinal photoreceptor cells and promotes the development and function of retinal cells. In children and adolescents, it can help prevent the onset and progression of myopia, and it is also important for brain development.

Dosage varies by age: infants aged 6 months to 1 year should take one capsule daily; children over 1 year old and adolescents should take 1–2 capsules daily; adults generally require a daily supplement of 200–300 mg (1–2 capsules). Pregnant and lactating women have higher requirements and should take no less than 200 mg daily under medical guidance. The recommended daily intake for adults is 250–500 mg.

Children may take DHA long-term but should periodically switch brands and use it cautiously during illness. Adults generally should not take it long-term, although individuals with high mental demands may take it appropriately. Excessive intake may cause side effects, so DHA should be supplemented rationally under the guidance of a physician or nutritionist. At the same time, maintaining a balanced diet, increasing outdoor activities, reducing near-work eye strain, and undergoing regular eye examinations are important for myopia prevention. Follow the product instructions and medical advice when taking DHA, and seek medical attention promptly if any concerns or adverse reactions arise.