Temporal constraints on lens compensation in chicks
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چکیده
منابع مشابه
Temporal constraints on lens compensation in chicks
If the effective focal length of a growing eye is modified by spectacle lenses, the eye compensates by altering its growth, thereby keeping images in focus, a process we presume is similar to normal emmetropization. Using chicks, we have investigated how much visual exposure the eye needs to exhibit the two principal components of ocular compensation: altered rate of elongation (a scleral mecha...
متن کاملTemporal properties of compensation for positive and negative spectacle lenses in chicks.
PURPOSE Chicks' eyes rapidly compensate for defocus imposed by spectacle lenses by changing their rate of elongation and their choroidal thickness. Compensation may involve internal emmetropization signals that rise and become saturated during episodes of lens wear and decline between episodes. The time constants of these signals were measured indirectly by measuring the magnitude of lens compe...
متن کاملPatching fellow eyes during subjective night does not prevent disruption to minus lens compensation in constant light-reared chicks
PURPOSE This study re-examined an earlier claim that monocular patching during subjective night (i.e. patched at the usual time that night would occur) in the chicks reared in continuous lighting (CL), offered unpatched eyes some protection from the ocular effects of CL. It also examined whether this monocular patching protected unpatched eyes against the disruptive effect of CL on compensation...
متن کاملTemporal Constraints on Trajectories in Qualitative
State space equations that constrain the values of related variables within individual states are often used in models of continuous dynamical systems such as ordinary differential equations . These models do not allow the representation of non-local information constraining the behavior of the system across time except through the application of continuity . Qualitative simulation (Kuipers, 19...
متن کاملTemporal Constraints on Trajectories in Qualitative Simulation
We present a new method for specifying temporal constraints on trajectories of dynamical systems and enforcing them during qualitative simulation. Such constraints are otherwise inexpressible using standard qualitative reasoning techniques. Trajectory constraints can be used to restrict the simulation to a region of the state space and to inject discontinuities. This capability can be used to f...
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ژورنال
عنوان ژورنال: Vision Research
سال: 2002
ISSN: 0042-6989
DOI: 10.1016/s0042-6989(02)00300-0