Taking cod liver oil has some benefits for the eyes, but it does not play a therapeutic role. Cod liver oil is rich in vitamin A and vitamin D. Vitamin A can synthesize retinal, which is an important part of the eye’s ability to perceive dark light, and if it is deficient, the human eye’s ability to perceive sunlight will be weakened, and it may also cause dry eye or night blindness. So moderate consumption of cod liver oil can prevent eye diseases is good for the eyes. If patients take a large amount of cod liver oil for a long time may lead to bone and joint swelling, fever, vomiting, diarrhea and other chronic toxic symptoms, patients with hypercalcemia, chronic renal failure, hyperphosphatemia with renal rickets and other diseases can not be taken. Cod liver oil has certain benefits for the eyes, it is recommended that patients under the guidance of a doctor reasonable medication, do not take on their own, so as not to overdose to produce toxic reactions.