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Area=πr², d≈2cm (less than maximal d) -> r≈1cm, thus the area in question is roughly 3.14*1cm*1cm≈3.14cm² UPD by request (ref): The vitreous body base middle is at ora serrata (+-2mm), so we should calculate the area at this level. Here is the reference of the diameter: from: Basic and Clinical Science Course, Section 02


Firstly, note that "eye color" is actually iris color. The person with a lighter iris will have more straylight compared to person with brown iris: The graph represents Intraocular straylight of the age-matched groups. Participants with light-blue-colored iris showed significantly higher values for intraocular straylight than those of the other groups. ...


Don't be confused by the word "humour": the vitreous body is presented in birth and has very low "exchange" rate of its components, while aqueous is in constant turnover. Secondly, the vitreous is an organ-like structure and is separated from other eye structures by its membrane, while aqueous is fluid produced by ciliary body processes into the posterior ...


A comment by @ddiez made a good point at identifying some ambiguity in the question: sight vs concentration. Sight has been answered well by @Ilan. You can't test to see if someone is squinting to concentrate. I stick by my original comment: Isn't it a social tool to show others you're thinking? It would be difficult to come up with a scientific ...


Short answer The number of eyes are not always even-numbered. In fact, many present-day lower vertebrates feature an uneven number of eyes. Background Eyes can be generally defined as photosensitive organs. Besides the regular paired eyes, lower vertebrates such as fish, amphibians and reptiles feature an unpaired (single) brain structure called the pineal ...


The phenomenon in question is probably related to people with uncorrected/undercorrected myopia. This "ancient" phenomenon is called stenopeic slit effect (a case of pinhole effect): when the person squints the visual acuity becomes better because of smaller blur circles: the "slit" between the eyelids is the key point improving blurring. One can check if ...


The corneal thickness is genetically programmed. There are multiple genes that induce the final corneal thickness: USP37, Chromosome 2; GPR15, 3; TIPARP, 3; CWC27-ADAMTS6, 5; RXRACOL5A1, 9; LCN12-PTGDS, 9; FGF9-SGCG, 13; and at least 6 other genes. source other questions had to be asked as separate ones

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