While there is no cure, doctors often prescribe vitamin A, which the retina needs to survive. In one study, researchers measured omega-3s in the diets of 357 adults with RP who had been taking 15,000 IU of vitamin A palmitate per day for an average of five years, under the care of a physician.
Compared to those who consumed low levels of omega-3s, those who got an average of at least 200 mg of omega-3 fatty acids per day saw acuity for distance vision decline 40 percent more slowly annually, and central field-of-vision decline 50 percent more slowly.
Doctors explained that omega-3s help proteins in the eye transport vitamin A to the retina.