[Frequency of the pupillary response following flicker stimuli (author's transl)]. 1977

E Alexandridis, and M Manner

Pupillary function was tested in 3 different age groups (20-30, 40-50, 60-70 years) of 8 patients each. The pupillary response was picked up by means of a portable IR-reflex-pupillometer, which registered the consensual pupillary light reflex in one eye, while the other eye was stimulated by flashes of different frequencies. Measurements were made of how many Hertz (Hz) the pupil dilated in the dark phases (intervals) between the flashes (flicker-fusion frequency). In the younger age group an average value of 3.15 Hz was obtained, the middle group fused at 2.89 Hz, the older group at 2.61 Hz. These differences are explained mainly by muscular and vascular degeneration of the iris.

UI MeSH Term Description Entries
D007498 Iris The most anterior portion of the uveal layer, separating the anterior chamber from the posterior. It consists of two layers - the stroma and the pigmented epithelium. Color of the iris depends on the amount of melanin in the stroma on reflection from the pigmented epithelium.
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010775 Photic Stimulation Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity. Stimulation, Photic,Visual Stimulation,Photic Stimulations,Stimulation, Visual,Stimulations, Photic,Stimulations, Visual,Visual Stimulations
D011680 Pupil The aperture in the iris through which light passes. Pupils
D012025 Reflex, Pupillary Constriction of the pupil in response to light stimulation of the retina. It refers also to any reflex involving the iris, with resultant alteration of the diameter of the pupil. (Cline et al., Dictionary of Visual Science, 4th ed) Pupillary Reflex
D005425 Flicker Fusion The point or frequency at which all flicker of an intermittent light stimulus disappears. Flicker Fusions,Fusion, Flicker,Fusions, Flicker
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D000367 Age Factors Age as a constituent element or influence contributing to the production of a result. It may be applicable to the cause or the effect of a circumstance. It is used with human or animal concepts but should be differentiated from AGING, a physiological process, and TIME FACTORS which refers only to the passage of time. Age Reporting,Age Factor,Factor, Age,Factors, Age
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly

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