We studied the effect of cerebellar lesions on the 3-D control of the rotational vestibuloocular reflex (RVOR) to abrupt yaw-axis head rotation. Using search coils, three-dimensional (3-D) eye movements were recorded from nine patients with cerebellar disease and seven normal subjects during brief chair rotations (200 degrees /s(2) to 40 degrees /s) and manual head impulses. We determined the a...

We present a numerical solution of the natural convection from inclined wall plumes which arise from a line thermal source imbedded at the leading edge of an adiabatic plate with arbitrary tilt angle between 0 and n/2, and embedded in a fluid-saturated porous medium. An appropriate transformation of the governing boundary-layer equations is proposed and a very efficient novel numerical solution...

Horizontal, vertical, and torsional eye movements were recorded using the magnetic search-coil technique during linear accelerations along the interaural (IA) and dorsoventral (DV) head axes. Four squirrel monkeys were translated sinusoidally over a range of frequencies (0.5-4.0 Hz) and amplitudes (0.1-0.7 g peak acceleration). The linear vestibuloocular reflex (LVOR) was recorded in darkness a...

Diagnostic lumbar puncture was performed on 76 neurological inpatients. They were randomly allocated to one of four bed rest positions for four hours following the procedure (supine and horizontal, prone and horizontal, supine with head-down tilt and prone with head-down tilt) after which they were allowed to get up. There was no substantial or significant difference in the incidence of headach...

It is well known that the aberrations of the cornea are partially compensated by the aberrations of the internal optics of the eye (primarily the crystalline lens) in young subjects. This effect has been found not only for the spherical aberration, but also for horizontal coma. It has been debated whether the compensation of horizontal coma is the result of passive mechanism [Artal, P., Benito,...

To study the radar characteristics of tiltrotor aircraft when considering rotor rotation and tilting actions, a dynamic calculation method (DCM) based on physical optics theory diffraction is presented. The results show that cross section single periodic it rotates, while increasing speed can shorten this period. At fixed tilt angle, overall cabin plus still exhibits various at different azimut...

purpose: to evaluate the effect of limited dissection of tenon sheath on the outcome of horizontal strabismus surgery. methods: patients with horizontal strabismus, aged between six and 50 years, were enrolled in this non-randomized study. patients with pattern and vertical strabismus or a history of strabismus surgery were excluded. the strabismus surgeries consisted of bimedial recession (bmr...

Background Nauseogenicity is determined by exposure time, frequency and acceleration of real motion. Our aim was to determine the nauseogenicity of these parameters for the optokinetic equivalent of OVAR (Off Vertical Axis Rotation). Methods The visual stimulus was a computerised scene of coastline as seen by a 'pilot' at moderate altitude. The scene could be rotated at different frequencies an...