This is extracted from a longer lecture by Dr. George L. Spaeth entitled “Do you really need to gonioscope your patients?” That lecture is 49 minutes long and is under the “Introduction.” I highly recommend the entire lecture, but to hear only about the grading system one can use this video (22 minutes).

George L. Spaeth, MD Louis J. Esposito Research Professor Spaeth/Katz/Myers/Thomas Wills Eye Hospital Jefferson Medical College

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