In 2017, Salobrar-Garcia performed an assessment of the visual acuity, contrast sensitivity, color vision, and visual integration in the Alzheimer's disease progression according to the scale GDS. This study was conducted with 38 patients with mild to moderate Alzheimer's disease as well as a control base. Patients with mild Alzheimer’s revealed a drastic decrease in visual acuity, spatial based contrast sensitivity (“the higher the spatial frequency, the greater the loss of CS perception”), and lowered ability to see blue-toned colors. Although patients with moderate Alzheimer’s exhibited far greater cognitive decline, their performance on the named tests was congruent to the participants with mild Alzheimer’s. According to this study (Garcia, 2017) “a significant increase of the total number of errors in the color test (p < 0.05)” was recorded in all instances. No notable differences were noted between the mild and moderate groups for visual acuity, contrast sensitivity. Results reveal that visual tests are a good early marker for Alzheimer’s.
The CEE (Color Expanse Examination) combines an automated, portable testing system featuring an interactive response module with indicator light.