[A portable automatic infrared refractor].
In order to measure refractive errors in infants who cannot be measured by the conventional refractor, we have devised a portable automatic infrared refractor. This device has four unique advantages. The first is that an examiner can measure refractive states at any position. The second is an auto-start system. The third is that this device enables the patient to look at an external fixation object through the half-mirror of the handipiece. The fourth is its portability. From the measurements on 44 infant subjects, a good correlation between this device and the conventional refractor was obtained. The specifications are: minimal pupil diameter, 2.9 mm; measurement range: spherical power +/- 20 D, cylindrical power +/- 7 D. We believe that this device has wide applicability in clinical examination. For example, we can use this device for measurements of refractive states during cataract surgery.
Hirai
H
H
Department of Ophthalmology, Nara Medical University, Kashihara, Japan.
Uozato
H
H
Saishin
M
M
D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007259:Infrared Rays; D012029:Refraction, Ocular; D014787:Vision Tests / Q000295:instrumentation