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Blurred Vision From Fish Oil

By Kate Beck

Fish oil is a product derived from a variety of fish, such as salmon, herring, tuna and cod. Doctors often recommend fish oil for the omega-3s, fatty acids that may help prevent health conditions such as high cholesterol. If your doctor thinks fish oil could help you, discuss the possible side effects, so that once you begin using the supplement, you will know if a symptom such as blurred vision could result from fish oil use.

Side Effects

Taking fish oil does not typically cause blurred vision. Side effects from taking the supplement orally include nausea, belching, diarrhea, skin rash and nosebleeds. Fish oil may affect how your blood clots, and this could result in an increased risk for bleeding, especially if you take blood-thinning medications or if you have a blood disorder.

Possible Cause

Taking fish oil supplements will not likely result in blurred vision. However, if some of the fish oil comes in contact with your eye, this could cause an episode of blurry vision. The fish oil will not harm your eye, but you may want to use artificial tears to help wash the fish oil out of your eye.

Fish oil could have an indirect effect on your vision. If you have a history of retinal bleeds or other type of hemorrhage in the eye, taking fish oil could increase the risk of a hemorrhage reoccurring. These conditions can lead to blurred vision.

Blurred Vision

A number of eye conditions can result in blurred vision. You may have cataracts, macular degeneration or glaucoma. The optic nerve is the bundle of nerve fibers that transmits your visual information to the brain. Inflammation to the nerve can result in vision changes. If you have a gradual change in your vision, this could result from natural changes of your eye, and you may simply require an update in your eyeglass prescription.


If you experience vision changes, contact your eye doctor for an appointment. Sudden changes in your vision could indicate a serious condition and will require an immediate evaluation. You should not ignore vision changes since your doctor may have a treatment to clear your vision or prevent further vision loss.

During your visit with your eye doctor, discuss all your medications and the supplements you take, including fish oil. If your doctor believes that fish oil could have a role in a hemorrhage or another condition that caused your vision change, she may recommend that you stop taking the supplement.

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