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Home » Eye Care Services » Technology – Advanced Eye Care » AdaptDx Dark Adaptometer

AdaptDx Dark Adaptometer


We offer the AdaptDx test to measure the number of minutes it takes your vision to adjust from bright light to darkness. This number is your RI, or Rod Intercept. Your RI provides us with critical information to help determine if you have age-related macular degeneration (AMD).
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The AdaptDx Rapid Test only takes a few minutes per eye and is very easy to take – you just push a button when you see a light. We will have your results immediately so that we can discuss the findings and any next steps that may be required. The AdaptDx is made in the USA by MacuLogix, Inc. and is cleared for use by the FDA.
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AMD and Dark Adaptation
The cells in your eye that help you see in the dark (known as rods) are the first part of the eye affected by AMD. Because of this, the time it takes your vision to adapt from bright light to darkness can provide a very early indication of AMD. The AdaptDx® tests this quickly and easily. It is made in the USA by MacuLogix, Inc. and is cleared for clinical use by the U.S. Food and Drug Administration (FDA).

AMD Symptoms and Risk Factors
One of the earliest symptoms of AMD is poor or deteriorating night vision. As the disease progresses, symptoms may include distortion of straight lines or dark and blurry central vision. There are also several risk factors for AMD:
• Age 50 or older
• Family history of AMD
• Caucasian (white)
• Smoker or past smoker
• Being overweight
• Heart disease, high blood pressure or high cholesterol

If you are experiencing a symptom of AMD or have multiple risk factors, you should determine your RI time with an AdaptDx® test.

What is Your RI?
The AdaptDx® measures the time it takes your vision to adjust from bright light to darkness. This time is your RI, or rod intercept. Your RI provides critical information to help determine your AMD status.
• If your RI is less than 6.5, your dark adaptation is still good.
• If your RI is more than 6.5, it is an early warning of AMD.

Determining your RI allows us to monitor changes and take appropriate steps to protect your vision.
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How is RI time measured?
We use a device called the AdaptDx® to measure your RI, which is the number of minutes it takes your eye to adapt from bright light to darkness. Performed in a darkened room, the test is easy to take and non-invasive. The test does not require dilation of your pupils and nothing will touch your eye. During the test, you will watch for a series of lights and be asked to click a button each time you see them.

What happens if AMD is detected?
Measuring your RI helps us detect AMD at the earliest possible time, long before you notice any changes in your vision. If AMD is detected, there are a number of steps we can take to help protect your vision:
• Prescribe nutritional supplements with a combination of vitamins and minerals shown to slow progression of AMD4.
• Recommend life-style changes such as losing weight and quitting smoking.
• Recommend blue-blocking and/or UV protection for your eyeglasses and sunglasses.
• Actively monitor your condition by testing your RI on a regular basis.
• Possibly refer you to a retina specialist for further evaluation.
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