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Lost in the dark, but 20/20 on the chart
Patients may read the acuity chart well and still report difficulty driving at dusk, recovering after glare, navigating dim rooms, or recognizing hazards at night. Dark adaptation testing adds functional information by measuring how the retina recovers sensitivity after exposure to light.
20/20 is not night vision
High-contrast acuity does not measure low-luminance function or recovery after glare.
Function complements structure
Imaging shows anatomy. Dark adaptometry evaluates recovery of retinal sensitivity.
Rods can reveal early stress
Rod-mediated recovery is especially vulnerable to aging and several retinal disease processes.
THE UNSEEN EPIDEMIC
Why Night Vision Loss is the Canary in the Coal Mine for Retinal Health
A patient may have 20/20 vision and a normal OCT and still struggle to drive safely at
dusk or move through a dim room. The Unseen Epidemic shows primary eye care
professionals that impaired dark adaptation can be an early, measurable signal of retinal
dysfunction before structural changes appear on standard imaging.
Written for optometrists, general ophthalmologists, and practice owners, this practical
guide explains the science of rod-mediated vision, the evidence linking delayed dark
adaptation with retinal disease risk, and the steps for selecting patients, performing
testing, interpreting results, and deciding when to monitor, investigate, or refer. It
addresses high-risk patients, including those over 50, people with diabetes or a family
history of AMD, patients taking potentially retinotoxic drugs, and those who quietly stop
driving at night, so clinicians can act earlier.
Just as important, the book addresses the business case. Modern wearable dark-
adaptation testing can be performed by trained staff in under 10 minutes, supporting
efficient clinical workflow while providing an objective functional measurement to
complement OCT and fundus imaging. The manuscript outlines a model in which
eligible diagnostic testing, appropriate coding, repeat monitoring, and downstream
diagnostic care can help a practice recover its investment quickly while differentiating
itself through proactive retinal care, delivering a clear path to implementation.
The Unseen Epidemic is not a call to replace imaging or turn every primary eye doctor
into a retina specialist. It is a guide to adding a missing functional dimension to eye
care, helping clinicians move beyond ‘your eyes look fine’ and act on the early warning
signs that matter most to patients: safety, independence, and the protection of sight.
Clinical Perspective
Jeff Hicks, O.D.
Optometrist
“Dark adaptometry checks the health of your retina by measuring how well your eyes adjust to the dark. It catches problems years before we can see them in images. It’s one of the most important tools we have for preventing vision loss.”