human eye diagram

Beginning from the external surface (choroid side), the retina consists of the following layers: This layer lies close to the choroid. The Eyelids (Palpebrae) and Eyelashes: The eyelids are two movable folds situated above and below front of the eye. Die horizontale Augenöffnung gibt den zeitlichen Bereich an, in dem eine Abtastung (Auswertung) des logischen Momentanzustandes möglich ist und wird unter anderem durch das Symbolübersprechen limitiert. These cones are very densely packed (in a hexagonal pattern). The fovea is a depression in the inner retinal surface, about 1.5 mm wide, the photoreceptor layer of which is entirely cones and which is specialized for maximum visual acuity. The iris is a circular muscular diaphragm containing the pigment giving eye its colour. Get the latest research information from NIH: staff guidance on coronavirus (NIH Only). The table below shows the refractive indices of the various parts of the eye. The fovea is also a pit in the surface of the retinas of many types of fish, reptiles, and birds. The pigments also enhance the acuity of the fovea by reducing the sensitivity of the fovea to short wavelengths and counteracting the effect of chromatic aberration. 96 PPI / (20/10.5 vision) = 50.4 PPI for 20/20 vision).
It serves as a soft, shockproof pad.
It is this membrane that becomes inflamed in conjunctivitis or “pink eye”. When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals. It helps to maintain the shape of the eyeball and also contributes to intraocular pressure (pressure inside the eyeball). 1. The cells give rise to pigmented pro­cesses (projections), extending into the next layer. "Central fovea" redirects here. This area is called the blind spot because it is devoid of receptor cells. Saved by Melissa Bena. It is divided into the sclera and the cornea.

They sit in two bony cavities called the orbits, which are present in the skull. The eye is a hollow, spherical structure measuring about 2.5 cm in diameter.

In a number of ways, the human eye works much like a digital camera: Light is focused primarily by the cornea — the clear front surface of the eye, which acts like a camera lens. Histologically the only region of the retina where, Anatomical fovea / fovea centralis (clinical: macula). [6], The size of the fovea is relatively small with regard to the rest of the retina. In this article we will discuss about the structure of human eye. By the action of iris muscles the size of pupil can be increased or decreased. […]

The nerve fibres from all parts of the retina converge to leave through a blind spot (= Optic disc) which contains no rods and cones and, therefore, no image is formed at this spot. Light reflects off an object, and if that object is in your field of vision, it enters the eye.. Diameter = 1.5mm (~1 disc-diameter) (about 5 deg of, the central floor of depression of fovea centralis, Represents the precise center of the macula, This page was last edited on 16 October 2020, at 01:38.

This allows the light to be sensed without any dispersion or loss. Among mammals, it is found only in simian primates. In the primate fovea (including humans) the ratios of ganglion cells to photoreceptors is about 2.5; almost every ganglion cell receives data from a single cone, and each cone feeds onto between 1 and 3 ganglion cells. These include the eyebrows, the eyelids and eyelashes, the conjunctiva and the lacrimal apparatus. Diese werden mithilfe eines nachleuchtenden Oszilloskops oder Speicher-Oszilloskops übereinander dargestellt. In addition to bipolar, horizontal neurons and amacrine cells, the internal nuclear layer also contains the cell bodies of the retinal gliocytes (= cells of Muller).


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