TRIAL OF ROYAL CANADIAN NAVY COLOUR VISION LANTERN IN COMPARISON WITH OTHER TESTS OF COLOR VISION

Advantages of the Royal Canadian Lantern appear to be 1 Simplicity of administration. Little training necessary. Results not influenced by individual operators whereas the Edridge-Green lantern requires considerable training and is difficult to administer. 2 Short test -- approximately 1 12 minutes per normal individual. The American Optical Company A-O plates complete -- 1 12 3 minutes Edridge-Green complete -- 3 minutes. 3 simple to interpret and to score. Coaching or previous training has minor influence on results of lantern but marked influence on results of A-O plates. 4 Permits positive interpretation. 5 No special lighting required, therefore can always be given under standard conditions. A-O plates are seldom given under standard conditions, with consequent wide variance in results. 6 Less exacting in selection than A-O plates given and scored in accordance with existing instructions.