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. Alzheimer's disease (AD) is the most common cause of dementia in the elderly. Although AD treatment is still insufficient despite all the recent developments, detection and treatment in the early stage of disease have provided more clinical benefits.  Objective: In this study, we aimed to use the critical flicker fusion (CFF) threshold test to diagnose AD in the early stage.  Methods: In this study, 120 patients (above 65 years of age) and 50 control groups who were admitted to geriatrics outpatient clinic and diagnosed in early- and middle-stage AD were included. The remaining 58 patients and 25 healthy volunteers underwent comprehensive geriatric assessment and CFF testing.  Results: The mean CFF value of AD group was significantly lower than the control group (36.44±7.00 vs. 44.24±3.82, p 0.05). The cutoff value for the CFF variable was determined as 39 Hz [p&lt;0.001; area under the curve (AUC)=0.852; sensitivity=70.69% (95% confidence interval [95%CI] 57.3–81.9); specificity=92.00% (95%CI 74.00–99.00)].  Conclusions: There is a significant difference in mean CFF values between AD and healthy groups. CFF testing may play an important role in diagnosing AD in the early stage.

A new diagnostic approach in Alzheimer's disease: The critical flicker fusion threshold