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The regulation of tear production (lacrimation) involves reflexes initiated by sensory neurons in the cornea. Corneal pain receptors (nociceptors) and mechanoreceptors detect damaging stimuli and induce tearing to cleanse the ocular surface (and, hence, Shigeta is right as tear gas stimulates pain receptors). Corneal neurons sensitive to drying of the ocular ...


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There are two possible ways to perform refractive operation: first, to perform the procedure on the cornea, the second - to exchange the crystalline lens with the artificial one. The second approach is extremely rare, because the lens (1) is inside the eye and (2) it allows us to accommodate (=change the focus of vision). Thus, this method is relevant ...


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"The flicker fusion frequencies of six laboratory insects, and the response of the compound eye to mains fluorescent ‘ripple’" (Miall, 1978) touches on flicker fusion thresholds for six different insect species commonly used in laboratory settings: Locusta migratoria, Periplaneta americana, Saturnia pavonia, Antheraea pernyi, Glossina morsitans and ...


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The lacrimal gland, the major source for tear production, is situated just above the eye. It sends it's secretions to the eye via the lacrimal duct. Tears secreted collect in the conjunctiva of the upper lid. There is also a nasolacrimal duct which drains the tears from the eye into the nasal cavity. Hence the sniffles when we cry. How is it controlled? The ...


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Seeing in animals is at some level using Gabor wavelets (Marčelja 1980 and later authors). Your images reminds of a combination of two low frequency Gabor basis vectors. Apparently the nervous system does not have time to model the incoming image into Gabor components of other frequencies. Here is a picture of two low frequency Gabor basis vectors added. ...



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