There are many Pediatric optotypes when it comes to visual acuity, but only one is the gold standard. Why LEA® Symbols? Because Dr. Lea Hyvärinen, MD, PhD, FAAP, through years of research and refinement, developed the LEA® Testing System to provide a set of optotypes that blur equally at threshold. In other words, at the distance a patient can no longer differentiate the symbols, they all appear to be circles. As a result, visual acuity measurement is more accurate.

Dr. P. Kay Nottingham Chaplin, EdD explains in detail how and why the LEA® testing system works. You can read more about it here.