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Definition
| CELLS THAT ARE PART OF THE RETINA THAT EXSIST BETWEEN THE PHOTORECEPTORS (RODS AND CONES) AND THE GANGLION CELLS. THEY ACT INDIRECTLY OR DIRECLTY TO TRANSMIT SIGNALS FROM THE PHOTORECEPTORS TO THE GANGLION CELLS. |
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Definition
A RETINAL GANGLION CELL(RGC) IS A TYPE OF NEURON OF THE RETINA.
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Definition
| ALSO CALLED THE CRANIAL NERVE 2, TRANSMITS VISUAL INFORMATION FROM THE RETINA TO THE BRAIN. |
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THE OPTIC DISC OR OPTIC NERVE HEAD IS THE LOCATION WHERE GANGLION CELL AXONS EXIT THE EYE TO FORM THE OPTIC NERVE. THERE ARE NO LIGHT SENSITIVE RODS OR CONES TO RESPOND TO A LIGHT STIMULUS AT THIS POINT. THIS CAUSES A BREAK IN THE VISUAL FIELD CALLED :THE BLIND SPOT". THE OPTIC DISC REPRESENTS THE BEGINNING OF THE OPTIC NERVE. (THE SECOND CRANIAL NERVE) AND IS THE POINT WHERE THE AXONS OF RETINAL GANGLION CELLS COME TOGETHER. THE OPTIC DISC IS ALSO THE ENTRY POINT FOR THE MAJOR BLOOD VESSELS THAT SUPPLY THE RETINA. |
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Term
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Definition
| FOCUSES LIGHT ENTERING THE EYE ON THE RETINA |
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Term
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Definition
| A SERIES OF FIBERS CONNECTING THE CILIARY BODY AND LENS OF THE EYE. |
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Definition
| THE LENS BECOMES HARD AND OPAQUE. THIS CAUSES VISION TO BECOME HAZY AND DISTORTED. THIS EVENTUALLY CAUSES BLINDNESS. THE BLINDNESS CAN BE TREATED WITH THE SURICAL REMOVAL OF THE LENS AND REPLACED WITH A LENS TRANSPLANT. |
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Term
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Definition
| A CLEAR, WATERY FLUID THAT FILLS THE ANTERIOR SEGMENT OF THE LENS. SIMILAR TO BLOOD PLASMA. |
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Term
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Definition
| A GEL-LIKE SUBSTANCE THAT FILLS THE POSTERIOR SEGMENT OF THE LENS. HELPS TO PREVENT THE EYEBALL FROM COLLAPSING INWARD. |
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| THE VASCULAR STRUCTURE ENCIRCLING THE ANTERIOR CHAMBER OF THE EYE AND THROUGH WHICH THE AQUEOUS HUMOR IS RETURNED TO BLOOD CIRCULATION |
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Term
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Definition
| GLAUCOMA IS NOT JUST ONE EYE DISEASE, BUT A GROUP OF EYE CONDITIONS RESULTING IN OPTIC NERVE DAMAGE, WHICH CAUSES LOSS OF OF VISION. ABNORMALLY HIGH PRESSURE INSIDE YOUR EYE (INTRAOCULAR PRESSURE) USUALLY, BUT NOT ALWAYS, CAUSES THIS DAMAGE. |
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Term
OPHTHALMOSCOPE
(FUNDOSCOPE) |
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Definition
| AN INSTRUMENT THAT ILLUMINATES THE INTERIOR OF THE EYEBALL; ALLOWING THE RETINA, OPTIC DISC, AND INTERNAL BLOOD VESSELS TO BE SEEN. |
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Term
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Definition
| THE FUNDUS OF THE EYE IS THE INTERIOR SURFACE OF THE EYE, OPPOSITE THE LENS, AND INCLUDES THE RETINA, OPTIC DISC, MACULA, FOVEA, AND POSTERIOR POLE. THE FUNDUS CAN BE VIEWED WITH AN OPHTHALMOSCOPE. |
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