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What could cause blurred vision in one eye only?

David R. Demartini, MD
Ophthalmology
The eyeball is a biologic camera. It gathers light, focuses the light on the retina, and the retina interprets the light to send an image back to the brain. All these functions have to work well to get a clear image. Genereally the eyes work independently so that eventhough one eye works poorly the other can take over so that the patient can function reasonable well.
Taking each function separately: Fcousing is accomplished by the tear film, cornea and the chrystalline lens. Focusing could be affected by dryness, mucus, discharge, distortion, cloudyness or diseases to the focusing structures. If these focusing mechanisms are working well but the eye is still blurred, then there has to be a problem with the retina or brain.
The retina can be affected by distorting problems such as swelling, membranes nutrition, detachment or degeneration. Finally the brain can ocasionally be the cause for one eye to see better or worse than the other. Generally, brain problems cause problems with both eyes.
Because there are so many functions and systems that need to work together correctly only a complete eye exam can give the reason for any individual's vision problem.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.