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6

Short answer Image blur on the retina is the most important monocular cue for lens accommodation. Background Focussing of an image on the retina is mediated by the lens. Re-shaping of the lens to focus the image on the retina is called accommodation. In general , the main cues for focussing are retinal disparity and blur, and to a lesser extent proximal ...


1

Short answer SSVEP frequency corresponds to stimulus frequency and SSVEP amplitude decreases with stimulus frequency. Background The simplest form of steady state visual-evoked potentials (SSVEPs) are those to flash stimuli. Herrmann (2001) studied the SSVEP by recording the EEG from the visual cortex at various flash frequencies. He found that SSVEPs ...


13

Short answer Spectral sensitivity of cats indeed ventures into the UV, but not beyond ~320 nm. Their maximum is likely similar to ours, i.e., ~750 nm. Background The spectral sensitivity of blue cones (photoreceptors detecting low wavelengths) of many species, including humans and cats, extends into the UV range (Fig. 1). Fig. 1. Human cone absorption ...


1

The image you gave is not clear because it does not show the fact that the divergence pattern of light from a close object is different from the divergence pattern of light from a distant object. Light rays from a close object (first image) diverge, and therefore they are in focus for the myopic eye. Light rays from a distant object (second image) is ...


-1

I see one possible advantage to round pupils. A slit pupil gives higher visual acuity vertically than horizontally because of diffraction and when a slit pupil is very nearly shut, there's high diffraction in the horizontal direction giving poor horizontal visual acuity. A round pupil on the other hand gives a creature the highest visual acuity in all ...


2

Its down to the structure of your eyes. The eyes are made of rods and cones, which have difefrences in detecting light. Now, compare the images below. As you can probably see, the peripherl vision is predominatlty due to your rods, and your central vision made of cones. Measured density curves for the rods and cones on the retina show an enormous ...


0

Because peripheral vision uses the peripheral retina,which has mostly rods as photoreceptor,while central vision uses the foveola,a central part of the retina which mostly has cones as photoreceptors. Rods are more sensitive to light. That is why they are more efficient in the dark.



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