cPLR Tester is a rapid screening device for retina and optic nerve diseasesTesting procedure can be done within 30 seconds providing immediate information about functional status of the retina and optic nerve. Illumination with strong light source always results in the rapid and complete pupil constrictions. Lack of the pupil response after red light illumination, with normal response after blue light illumination is indicative of retinal disease (NO RED – GOOD BLUE = RETINAL DISEASE). Lack of the pupil response after red and blue light illumination is indicative of the optic nerve disease (NO RED – NO BLUE = OPTIC NERVE DISEASE).
Normal chromatic pupil light reflex response:
GOOD RED - GOOD BLUE
Retinal disease chromatic pupil light reflex response:
NO (or poor) RED - GOOD BLUE
IN MANY PATIENTS ABNORMAL PUPIL RESPONSE TO CHROMATIC STIMULI (RED AND BLUE LIGHT) IS THE VERY EARLY SIGNS OF RETINA OR OPTIC NERVE DISEASE, WHICH CAN PRECEDE VISION PROBLEMS FOR MONTHS, ALLOWING IMMEDIATE THERAPEUTIC INTERVENTION.
NO RED - NO BLUE (optic nerve disease in a dog)