An instrument has been designed and constructed for measuring the light thresholds of the human retina. It utilizes certain basic parts of the Goldmann Projection Perimeter. There are certain unique features in the adaptometric design which provide high levels of sensitivity, reliability, and experimental facility. Any point of the retina may be investigated, and the differential thresholds may be determined under a wide variety of adaptation levels. Adaptometric profiles or classic dark-adaptation curves may be recorded.
II. Previous Equipment
Since the early contribution by Aubert1 in 1865, many instruments have been designed for adaptometry. Investigations of the light sense have included determinations of the dark-adaptation curve as well as measurements of the thresholds of various areas of the retina.2-5 The published reports, dealing with adaptometric studies prior to 1937, have been carefully reviewed by Adams6 and Sloan.7 Three adaptometers, designed for clinical testing, have
CAMPBELL CJ, RITTLER MC, KRAMER WG. A New Projection Adaptometer. Arch Ophthalmol. 1963;69(5):564-570. doi:10.1001/archopht.1963.00960040570006