Tobar 8660 Flashing Eye Glide Ball, Mixed

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Tomarev, S.I.; Callaerts, P.; Kos, L.; Zinovieva, R.; Halder, G.; Gehring, W.; Piatigorsky, J. (1997). "Squid Pax-6 and eye development". Proc. Natl. Acad. Sci. USA. 94 (6): 2421–2426. Bibcode: 1997PNAS...94.2421T. doi: 10.1073/pnas.94.6.2421. PMC 20103. PMID 9122210. unusual moles – if you have irregularly shaped or unusually coloured moles, you're more at risk of developing melanoma skin cancer and eye melanoma If they suspect you have melanoma of the eye, they'll refer you to a specialist centre for eye cancer.

Astigmatism - NHS Astigmatism - NHS

Völkel, R; Eisner, M; Weible, KJ (June 2003). "Miniaturized imaging systems" (PDF). Microelectronic Engineering. 67–68 (1): 461–472. doi: 10.1016/S0167-9317(03)00102-3. Archived from the original (PDF) on 2008-10-01. external radiotherapy – a machine is used to carefully aim beams of radiation at the tumour to kill the cancerous cellsColour vision is the faculty of the organism to distinguish lights of different spectral qualities." [47] All organisms are restricted to a small range of electromagnetic spectrum; this varies from creature to creature, but is mainly between wavelengths of 400 and 700nm. [48] For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD [42] (1.2 arcminute per line pair, or a 0.35mm line pair, at 1 m). A rat can resolve only about 1 to 2 CPD. [43] A horse has higher acuity through most of the visual field of its eyes than a human has, but does not match the high acuity of the human eye's central fovea region. [44] The eyeball can be affected in several ways. Abnormality of the eyeball in this syndrome includes a constricted pupil as well as redness and dryness of the eye, and this syndrome may result from interruption to the sympathetic innervation. The numerous posterior apertures are found around the posterior scleral foramen and they serve for the passage of the long and short ciliary arteries, veins and nerves.

Eyeball: Structure and function | Kenhub

On the cross-section of the eye, we can identify the two chambers of the eyeball filled with the aqueous humor; anterior and posterior. The anterior chamber of eyeball is found between the cornea and iris. The posterior chamber of eyeball is more of a slit-like cavity, found between the iris and lens. Multiple lenses are seen in some hunters such as eagles and jumping spiders, which have a refractive cornea: these have a negative lens, enlarging the observed image by up to 50% over the receptor cells, thus increasing their optical resolution. [1] Refractive cornea a b c d e f Land, M.F. (1989). "The eyes of hyperiid amphipods: relations of optical structure to depth". Journal of Comparative Physiology A. 164 (6): 751–762. doi: 10.1007/BF00616747. S2CID 23819801. When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. To look at a nearby object, the eyes rotate 'towards each other' ( convergence), while for an object farther away they rotate 'away from each other' ( divergence).

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Meyer-Rochow, V.B. (1974). "Structure and function of the larval eye of the sawfly larva Perga". Journal of Insect Physiology. 20 (8): 1565–1591. doi: 10.1016/0022-1910(74)90087-0. PMID 4854430.

Eyeball: Causes and Treatments - Verywell Health Swollen Eyeball: Causes and Treatments - Verywell Health

brachytherapy – tiny plates lined with radioactive material called plaques are inserted near the tumour and left in place for up to a week to kill the cancerous cells Halder, G.; Callaerts, P.; Gehring, W.J. (1995). "New perspectives on eye evolution". Curr. Opin. Genet. Dev. 5 (5): 602–609. doi: 10.1016/0959-437X(95)80029-8. PMID 8664548. The iris is sensory innervated by the long and short ciliary nerves, branches of the ophthalmic division of trigeminal nerve (CN V1). The two pupillary muscles receive autonomic motor innervation;The compound eyes of the arthropods are composed of many simple facets which, depending on anatomical detail, may give either a single pixelated image or multiple images per eye. Each sensor has its own lens and photosensitive cell(s). Some eyes have up to 28,000 such sensors arranged hexagonally, which can give a full 360° field of vision. Compound eyes are very sensitive to motion. Some arthropods, including many Strepsiptera, have compound eyes of only a few facets, each with a retina capable of creating an image. With each eye producing a different image, a fused, high-resolution image is produced in the brain. See also: Irritation §Eye irritation Conjunctival injection, or redness of the sclera surrounding the iris and pupil