Seasonal affective disorder (SAD) is a type of depression that typically occurs each year during fall and winter. Use of a light box can offer relief. But for some people, light therapy may be more effective when combined with another SAD treatment, such as an antidepressant or psychotherapy, also called talk therapy.

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Light boxes aren't regulated by the Food and Drug Administration (FDA) for SAD treatment, so it's important to understand your options.

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If you have past or current eye problems such as glaucoma, cataracts or eye damage from diabetes, get advice from your eye specialist before starting light therapy.

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Light therapy boxes can offer an effective treatment for seasonal affective disorder. Features such as light intensity, safety, cost and style are important considerations.

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You can buy a light box without a prescription, but it's best to use it under the guidance of a health care provider and follow the manufacturer's guidelines. Your health care provider may recommend a specific light box. Most health insurance plans don't cover the cost.

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It's best to talk with your health care provider about choosing and using a light box. If you're experiencing both SAD and bipolar disorder, the advisability and timing of using a light box should be carefully reviewed with your health care provider. Increasing exposure too fast or using the light box for too long each time may induce manic symptoms if you have bipolar disorder.

Light boxes are designed to deliver a therapeutic dose of bright light to treat symptoms of SAD. There are many different types of light boxes. All light boxes for SAD treatment are designed do the same thing, but one may work better for you than another.

Talk to your health care provider about light box options and recommendations, so you get one that's best suited to your needs.

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A light therapy box mimics outdoor light. It's thought that this type of light may cause a chemical change in the brain that lifts your mood and eases other symptoms of SAD, such as being tired most of the time and sleeping too much.