dark adaptation curve

Dark-adaptationcurve, a curve describing the change in light stimulation threshold during dark adaptation. Expose the subject's eyes to strong light and then leave the eyes in a dark environment. In the dark adaptation process, the threshold for a short flash is measured from time to time, and the result can be plotted as a curve. The ordinate of the curve is the logarithmic value of the flash brightness, and the abscissa is the dark adaptation time. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Before taboo: the eyes should be properly adapted. Requirements for inspection: Just cooperate with the doctor. Normal value Dark adaptation is a phenomenon in which the retinal adapts to darkness or low light intensity and the visual sensitivity increases, which is the corresponding word for adaptation. The light that suddenly disappeared from the bright spot and could not be seen at the time was gradually seen as the time spent in the dark was prolonged. This is a daily phenomenon. Clinical significance Abnormal results dark adaptation abnormalities manifested as night blindness, can be seen in vitamin A deficiency, retinitis pigmentosa and other eye diseases. People who need to be examined for night blindness. Precautions Contraindications before examination: eyes should be properly adapted. Requirements for inspection: Just cooperate with the doctor. Inspection process Expose the subject's eyes to strong light and then leave the eyes in a dark environment. In the dark adaptation process, the threshold for a short flash is measured from time to time, and the result can be plotted as a curve. The ordinate of the curve is the logarithmic value of the flash brightness, and the abscissa is the dark adaptation time. Not suitable for the crowd Inappropriate crowd: people whose retina is destroyed.

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