Can cataract patients eat onions?

Patients with cataracts can consume onions in moderation. Onions are rich in nutrients such as vitamin C and sulfides, which provide antioxidant support. They are not considered high-sugar, high-fat, or spicy irritating foods that should be avoided, so moderate consumption will not worsen the condition. If discomfort such as eye pain, redness, or swelling occurs after eating onions, medical attention is recommended.

Vitamin C in onions acts as an antioxidant, helping to reduce free radical damage to the lens and potentially slowing the progression of lens opacity. Sulfur compounds can promote blood circulation, improving nutrient supply to the eyes and supporting healthy ocular metabolism.

However, onions are somewhat irritating, and raw consumption may irritate the ocular mucous membranes, so sensitive individuals should exercise caution. Excessive intake may also cause gastrointestinal discomfort, indirectly affecting overall health; therefore, consumption should be controlled to avoid consuming too much at once.

It is recommended to cook onions before eating—methods such as stir-frying or stewing can reduce their irritancy. A serving size of 50–100 grams per meal is appropriate. Combining onions with other vegetables and high-quality protein sources ensures a balanced diet and prevents excessive intake of any single ingredient, thus supporting effective condition management.