How Cataracts Are Diagnosed
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What to Expect at Your Eye Appointment
When you see an eye doctor about possible cataracts, the first thing your doctor will most likely do is ask you about your symptoms.
Questions about your visual symptoms may include:
- How long you’ve noticed your symptoms
- Whether your symptoms come and go
- Whether your symptoms have gotten worse
- Whether your symptoms interfere with daily tasks
Your doctor may ask about specific visual symptoms, such as:
- Cloudy or blurred vision
- Distorted vision
- Worsened night vision
- Difficulty reading
- Difficulty driving
- Double vision
- Glare or a halo effect from bright lights
- Greater nearsightedness
- Faded color vision
Your doctor may also ask you questions about your personal and family medical history, such as:
- Whether you have diabetes
- Whether you’ve taken corticosteroids (oral or inhaled)
- Whether any family members have had cataracts
- Whether you’ve been diagnosed with another eye condition, such as glaucoma
- Whether you’ve experienced any eye injuries
- Whether you’ve undergone radiation as a medical treatment
Based on your answers, your doctor will decide what tests are indicated to look for cataracts and evaluate how much vision loss they’ve caused.
Diagnostic Tests for Cataracts
After reviewing your medical history and symptoms, your doctor may perform one or more tests to evaluate your vision and get a closer look at your eyes.
Tests used to diagnose cataracts include:
Visual Acuity Test For this test, you’ll look at an eye chart showing rows of capital letters (usually) that are large at the top of the chart and progressively smaller toward the bottom of the chart. Your doctor will ask you to read from various areas of the chart.
For the purpose of diagnosing cataracts, it’s also important to note whether your vision has significantly worsened since your last exam.
Dilated Eye Exam Also known as a retinal exam, this test involves putting drops in your eyes that make your pupils dilate (widen).
Dilating your pupils makes it easier to look at the back of your eyes, known as your retina. Your doctor will do this using a specialized magnifying device, known as an ophthalmoscope.
This test lets your doctor look through your lens to spot any abnormalities, as well as to look at your retina and optic nerve, which connects your retina to your brain.
Slit-Lamp Test This test involves using a specialized microscope to look at the structures in the front of your eye.
This microscope, known as a slit lamp, uses a narrow line of light to examine your cornea (outer eye layer), iris (colored part of your eye), the space between your cornea and iris, and your lens.
Tonometry This test measures the pressure inside your eye. It’s often used to help diagnose glaucoma, but may also be useful for cataracts.
Before the test, your doctor may give you eye drops to numb your eyes.
In a common version of the test, you’ll rest your head on a chin rest and line your eyes up with a device that delivers a puff of air to each eye. The machine will measure your eye pressure based on how light reflects off your eye when the puff takes place.
In the most accurate version of tonometry, the front of your eye will be stained with an orange dye, and you’ll rest your head on a support. A slit lamp will shine a narrow line of light onto your eyes.
Your doctor will place a measuring device (called a tonometer) so that it just touches the front of your eyes. Blue light will shine through the slit lamp, and your doctor will adjust a dial to read your eye pressure.
In another variation of the test, your doctor will use a small handheld device that resembles a pencil to instantly measure your eye pressure while touching it to your eye.
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