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This report describes USAARL's efforts to develop a disability glare tester that could be used for predicting night vision problems resulting from post refractive surgery, particularly for U. S. Army aviators. The nature & complexity of the problem are reviewed, along with current methods for assessing disability glare. The best current techniques focus on measuring & evaluating the effects of forward scatter in the eye. While elegant, forward scatter measurements alone do not reliably predict night vision problems due to aberrations induced by refractive surgery. Low-level efforts to develop a procedure that can predict night vision problems resulting from aberrations induced by refractive surgery have been pursued at USAARL for many years. The latest efforts focus on developing hybrid procedures that use an alternating spot threshold, with &d without a pupil-sparing glare annulus & pedestal, & a single spot threshold combined with a single-spot increment threshold procedure to obtain an indication of both blur & intraocular forward scatter. Further refinement & testing of these techniques is necessary to determine the efficacy of the approaches. glare, halo, forward scatter, aberrations, blur, disability glare, disability glare measurement, glare tester, refractive surgery, post refractive surgery night vision problem prediction and evaluation |
