Retinal imaging

These tests help doctors find and treat eye problems. Doctors can see if a disease is getting worse or if treatment is working.

You may need retinal imaging if:

• You have diabetes or diabetic retinopathy. These conditions can lead to poor vision and even blindness. A test can help your doctor see if treatment is working.
• Your doctor thinks you have wet macular degeneration. It can lead to vision loss. Tests can help find leaky blood vessels in your eye or blood vessels that are not normal, which are part of this disease.
• Your vision is getting worse and your doctor wants to find out why.

Eye exams, including retinal imaging, may help your doctor find a problem before it has a chance to get worse. And this gives you a better chance of protecting your vision. Retinal imaging should not take the place of a complete eye exam.

Retinal imaging tests are done in a hospital or doctor's office.

For some tests, the doctor will first use eyedrops to widen, or dilate, your pupils. You'll sit and wait for about half an hour for the drops to take effect.

For most tests, you'll sit in a chair facing the camera. You'll place your chin on a chin rest. And you'll brace your forehead against a bar to keep it still.

Keep your mouth closed, open your eyes as wide as you can, and stare straight ahead. You can breathe and blink normally while the camera photographs or scans your eyes.

It only takes a few minutes to take the pictures.

Angiogram

Before an angiogram, a dye is injected into your vein.

• An I.V. needle is placed in a vein in your arm, and the dye is injected. It takes only a few seconds for the dye to be visible in the blood vessels in your eyes.
• Photos are taken as the dye enters the eyes.
• This test usually takes about 30 minutes.

Eye ultrasound

Eyes closed: You sit in a chair with your eyes closed. The doctor puts ultrasound gel on your eyelid. Then the doctor gently moves a small ultrasound wand against your eyelid.

Eyes open: Eyedrops are used to numb your eyes. The doctor moves the ultrasound wand against the front surface of your eye.

If you know that the doctor will use drops to widen, or dilate, your pupils, think about having someone else drive you home. The drops make your eyes very sensitive to light. You may not be able to see well for a few hours. If you have sunglasses, take them with you to wear on the way home.

If you wear contact lenses, you may want to take your eyeglasses with you.