Chart Wavelength Dependant Pupillary Light Response
Fonte: RetinoGraphics, Inc. All rights reserved
Severe Progressive Retinal Atrophy in a 9 year-old Poodle Toy. Picture: Dr. JAK.
Observing PLR while introducing light from a calibrated red and blue source, it may be possible to differentiate a healthy eye from one affected by disease or other source of damage. The RetinoGraphics BPI-50 is a calibrated light source with peak blue light emission at 465nm and peak red emission at 660nm. Each color light source can be operated in high or low intensity modes. After the patient has been dark adapted, low intensity red light is introduced to the first eye while PLR is observed. Normal pupillary constriction indicates that no further information can be collected by using either high intensity red or blue light stimulus and thus concludes the test for the first eye. An abnormal low intensity red PLR indicates that it is appropriate to proceed with high intensity red and then blue stimulus. Careful observation of pupillary behavior during red and blue light stimulus can be compared with the chart below to assist in diagnosing possible causes of abnormal PLR.