Thomas Porter, O.D, FAAO

Dr. Porter, is an Assistant Professor in the Department of Ophthalmology at Saint Louis University's Eye Institute where he also serves as director of the Low Vision Service. He also serves as an Adjunct Assistant Professor in the Department of Occupational...

Warren McDonald, PhD

Dr. McDonald is currently the Director of Continuing and Distance Education at The University of North Carolina at Pembroke, a constituent member of the University of North Carolina System. He is a Licensed Optician in the State of North Carolina, and serves as a...

Richard Homeier

Richard Homeier has been a practicing optician since 1964 and is the owner of Optical Perspectives in Estes Park, Colorado. Richard holds both ABOM and NCLE-A certifications, and has been teaching ABO course material since 1991. Richard has twice been President of the...

Resultant Prism Chart

Download the printable resultant prism chart, handy for converting the two-component prescriber's method of specifying prism to a single component resultant method. Resultant Prism Chart