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Ophthalmoscopy
Ophthalmoscopy is a test that allows a health professional to see inside the back of the eye (called the fundus) and other structures using a magnifying instrument (ophthalmoscope) and a light source. It is done as part of an eye examination and may be done as part of a routine physical examination.
The fundus contains a lining of nerve cells (the
retina), which detects images seen by the clear, outer
covering of the eye (cornea). The
fundus also contains blood vessels and the
optic nerve. See a picture of the
structures of the eye
.
There are two types of ophthalmoscopy.
- Direct ophthalmoscopy . Your health professional uses an instrument about the size of a small flashlight with several lenses that can magnify up to about 15 times. This type of ophthalmoscopy is most commonly done during a routine physical examination.
- Indirect ophthalmoscopy . Your health professional wears a light attached to a headband and uses a small handheld lens. Indirect ophthalmoscopy provides a wider view of the inside of the eye and allows a better view of the fundus even if the lens is clouded by cataracts.
Why It Is Done
Ophthalmoscopy is done to:
- Detect problems or diseases of the eye, such as retina problems.
- Help diagnose other conditions or diseases that damage the eye.
- Evaluate symptoms, such as headaches.
- Detect other problems or diseases, such as head injuries or brain tumors.
How To Prepare
No special preparation is needed before having this test.
Your health professional may use eyedrops to widen (dilate) your pupils. This makes it easier to see the back of the eye. The eyedrops take about 15 to 20 minutes to dilate the pupil fully. Your health professional may also use eyedrops to numb the surface of your eyes. Tell your health professional if:
- You or anyone else in your family has glaucoma.
- You are allergic to dilating or anesthetic eyedrops.
You may have trouble focusing your eyes for several hours after the test. You may wish to arrange to have someone drive you home after the test. You also will need to wear sunglasses when you go outside or into a brightly lit room.
Talk to your health professional about any concerns you have
regarding the need for the test, its risks, how it will be done, or what the
results may indicate. To help you understand the importance of this test, fill
out the
medical test information form
(What is a PDF document?)
.
How It Is Done
Direct ophthalmoscopy
This is the most common type of examination to look at structures inside the eye.
- Your eyes may be dilated, and you will be seated in a darkened room and asked to stare straight ahead at some distant spot in the room.
- Looking through the ophthalmoscope, your health professional will move very close to your face and shine a bright light into one of your eyes. Each eye is examined separately.
- Try to hold your eyes steady without blinking.
WebMD Medical Reference from Healthwise
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