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Predictable eye-head coordination during driving

Article Abstract:

Observations of how people moved their eyes and heads to change gaze direction while driving a car demonstrated that eye and head movements followed a predictable pattern when confronted with a particular sequence of objects to observe. Drivers were selected for this research on oculomotor behavior because they tend to be too involved with driving to move their eyes and heads consciously, a necessary precondition for proving the predictability of changes in gaze direction.

Automobile driving, Motor vehicle driving, Gaze, Eye movements

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Old twist in a new tale

Article Abstract:

Rudiger Wehner and Gary Bernhard have neatly explained the helical twist in honey bees' photoreceptors. Without the twist, bees would see plants in the wrong colors. A one degree twist per micrometer prevents photoreceptors from responding selectively to the plane of polarization. Ironically, it was in honey bees that navigation by polarized light was first reported. Apparently an upward-pointing dorsal rim by the eye contains untwisted receptors.

Physiological aspects, Honeybee, Photoreceptors

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Fast-focus telephote eye

Article Abstract:

A new technique to estimate accommodation in living eyes shows that chameleon uses accommodation to determine distance. The slightly biconvex lens of the chameleon eye has a negative refractive power when unaccommodated. The negative power of the lens is responsible for increased corneal power and decreased lens power with high visual activity.

Ocular refraction, Chameleons

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