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We have determined the transverse chromatic aberration of the human eye by measuring the apparent offset of a two-color vernier viewed foveally through a displaced, pinhole aperture. For the same subjects, we also determined the longitudinal chromatic aberration for foveal viewing by the method of best focus. In both cases, the results were closely(More)
Psychometric performance was measured for contrast detection and spatial resolution tasks in foveal and peripheral vision. Objective evidence was obtained for a quantitative difference between resolution acuity and detection acuity in the peripheral field. These two types of spatial acuity differed by up to an order of magnitude (3 vs 30 c/deg at 30 deg(More)
The longitudinal chromatic aberration of the eye has been reported to decline with age. Using three different methods, we have measured the aberration in a group of young subjects (27-33 years old) and a group of older subjects (48-72 years old). In two of the methods we used a Badal optometer, either with or without an achromatizing lens incorporated, to(More)
The purpose of this study was to test the hypothesis that the night carrier landing performance of pilots who do not need prescriptive eyeglasses to fly is better than the performance of pilots who do. Night carrier landing scores (NCLS), age, career jet flight hours, and total career flight hours were obtained for 122 U.S. Navy fighter pilots participating(More)
Ocular chromatic aberration is expected on theoretical grounds to affect the quality of polychromatic interference fringes generated on the retina if the interferometer is not perfectly centered on the eye's visual axis. Of primary concern is a loss of contrast resulting from wavelength-dependent phase shifts of the fringes. By using an interferometer with(More)
BACKGROUND During flight training, student U.S. Naval helicopter pilots learn the use of flight instruments through a prescribed series of simulator training events. We recorded the training flights of 76 student U.S. Naval helicopter pilots undergoing the simulator phase of basic flight instrument training. From the final basic instrument simulator flight,(More)
Maxwellian-view projection systems are used clinically to evaluate visual acuity in cataract patients because they allow the clinician to direct a beam of light around any localized opacity. However, theory predicts that, as the beam is displaced from the visual axis, acuity will suffer with those instruments using white light due to the effects of ocular(More)
INTRODUCTION Military aircrew and other operational personnel frequently perform their duties at altitudes posing a significant hypoxia risk, often with limited access to supplemental oxygen. Despite the significant risk hypoxia poses, there are few studies relating it to primary flight performance, which is the purpose of the present study. METHODS(More)
Memory deficits and other cognitive symptoms frequently associated with mTBI are commonly thought to resolve within 7-10 days. This generalization is based principally on observations made in individuals who are in the unstressed environmental conditions typical of a clinic and so does not consider the impact of physiologic, environmental, or psychological(More)
INTRODUCTION Normobaric hypoxia, which does not entail an altitude chamber, but reduces the fraction of inspired oxygen (02) by diluting air with nitrogen, is finding increased use. The reduced oxygen breathing device (ROBD-2) is one of several commercial devices for generating such normobaric hypoxia. Reported here are results of a procedure to check the(More)