[The significance of points alpha and beta on the dark adaptogram of the normal eye].
OBJECTIVE
To determine the meaning of the points alpha and beta of the curve during dark adaptation.


METHODS
In this paper I studied the curves during dark adaptation of the 48 normal eyes, examined at the Goldmann-Weekers adaptometer, for 30 minutes in standard conditions. The study had two stages: 1. To find out the mathematical low which defined the phenomenon; 2. To give a physiological explanation of the phenomenon.


CONCLUSIONS
1. Distribution in time of point alpha and point beta recognized mathematical low of normal log. 2. The cones adapted to the dark into two phases: from the beginning of the adaptation to the point alpha; after point alpha till before point beta. 3. The rods adapted in three phases: a) before point alpha to the point alpha; b) from point alpha to the point beta; c) after point beta to the terminal threshold.


CONCLUSIONS
Point beta gained a new meaning: point beta represents the end of the cone's adaptation.
Stan
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Clinica Oftalmologică, Cluj-Napoca.
Călugăru
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D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003623:Dark Adaptation / Q000502:physiology*; D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D012016:Reference Values; D018709:Statistics, Nonparametric; D013997:Time Factors