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1971/09/06
| USD / onsa | |
| Gold | 41.8 | |
| Silver | 147.2 |
Gold Historical Gold Presyo Tsart at Graph
360 araw graph ,
1 Ounce Gold=? USD
Silver Historical Silver Presyo ng Tsart at Graph
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1 Ounce Silver=? USD
ginto balita:
- Human eye | Definition, Anatomy, Diagram, Function, Facts - Britannica
Human eye, specialized sense organ in humans that is capable of receiving visual images, which are relayed to the brain The anatomy of the eye includes auxiliary structures, such as the bony eye socket and extraocular muscles, as well as the structures of the eye itself, such as the lens and the retina
- Human eye - Vision, Perception, Anatomy | Britannica
If one eye is fixed on a point in space, the visual field for this eye may be thought of as the part of a surface of a sphere on to which all visible objects are projected The limits to this field will be determined by the sensitivity and extent of the retina and the accessibility of light rays from the environment
- Human eye - Vision, Retina, Optics | Britannica
Human eye - Vision, Retina, Optics: The first line of protection of the eyes is provided by the lids, which prevent access of foreign bodies and assist in the lubrication of the corneal surface
- Visual field defect | Causes, Symptoms Treatment | Britannica
Visual field defect, a blind spot (scotoma) or blind area within the normal field of one or both eyes In most cases the blind spots or areas are persistent, but in some instances they may be temporary and shifting, as in the scotomata of migraine headache
- Human eye - Eye Movements, Vision, Coordination | Britannica
Human eye - Eye Movements, Vision, Coordination: Because only a small portion of the retina, the fovea, is actually employed for distinct vision, it is vitally important that the motor apparatus governing the direction of gaze be extremely precise in its operation, and rapid
- Human eye - Eye Movements, Vision, Anatomy | Britannica
The optical system of the eye is such as to produce a reduced inverted image of the visual field on the retina; the system behaves as a convex lens but is, in fact, much more complex, refraction taking place not at two surfaces, as in a lens, but at four separate surfaces—at the anterior and the posterior surfaces of the cornea and of the
- Optic nerve | Vision, Retina. Optic Chiasm | Britannica
Optic nerve, second cranial nerve, which carries sensory nerve impulses from the more than one million ganglion cells of the retina toward the visual centres in the brain The vast majority of optic nerve fibres convey information regarding central vision
- Human eye - Temporal Summation | Britannica
The testing of the eyes by the ophthalmologist or optometrist is essentially a determination of visual acuity Here the subject is presented with the Snellen chart , rows of letters whose details subtend progressively smaller angles at the eye
- Snellen chart | Optometry, Visual Acuity Testing | Britannica
Snellen chart, chart used to measure visual acuity by determining the level of visual detail that a person can discriminate It was developed by the Dutch ophthalmologist Herman Snellen in 1862 and was adopted by medical professionals in many countries who have used it for more than 100 years
- Visual pigment | Photoreceptors, Retinal, Rods Cones | Britannica
Many vertebrate animals have two or more visual pigments Scotopsin pigments are associated with vision in dim light and, in vertebrates, are found in the rod cells of the retina; the retinal 1 forms are called rhodopsins, and the retinal 2 forms porphyropsins
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