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In page Adaptation (eye):
"Ophthalmologists sometimes measure patients' dark adaptation using an instrument known as a dark adaptometer. Currently, there is one commercially available dark adaptometer, called the AdaptDx. It works by measuring a patient's Rod Intercept (RI) time. RI is the number of minutes it takes for the eye to adapt from bright light to darkness. This RI number provides a clear and objective measurement of retinal function with 90% sensitivity and specificity.[1] Basically, an RI of less than 6.5 minutes indicates a healthy dark adaptation function. However, an RI higher than 6.5 indicates impaired dark adaptation.
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