4. what is the difference between closed-angle and open-angle glaucoma?
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Differences in angle In open-angle glaucoma, the iris is in the right position, and the uveoscleral drainage canals are clear. But the trabecular meshwork isn't draining properly. In closed-angle glaucoma, the iris is squeezed against the cornea, blocking the uveoscleral drains and the trabecular meshwork.
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Close your left eye. If the object stays centered, your right eye (the one that's open) is your dominant eye. If the object is no longer framed by your hands, your left eye is your dominant eye.
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Depending on the extent of the blockage, your vision may improve, worsen, or remain the same. Vein occlusions can occasionally be complicated by growth of abnormal blood vessels, which can result in bleeding into the vitreous jelly of the eye or a severe type of glaucoma called neovascular glaucoma.
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The risk of early-onset glaucoma depends mainly on heredity. Structural abnormalities that impede fluid drainage in the eye may be present at birth and usually become apparent during the first year of life. Such abnormalities may be part of a genetic disorder that affects many body systems, called a syndrome.
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Base Curve (BC): The base curve determines what type of fit is required for the lens to meet the curve of your eye; this is usually written in millimeters or sometimes with the words: flat, median or steep.
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No there is not a big diff between the two base curves. However, it's the relationship between diameter and base curve that is more important. Also, the material of the lens can also affect the fit. You can have 3 diff contact lenses with the same BC, Diameter and power and they will all fit differently.
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In primary angle closure glaucoma, the underlying mechanism is primarily pupillary block, while in secondary forms there are other underlying causes that either push the iris forward from behind or pull the iris forward to contact trabecular meshwork.
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Antihistamines and decongestants contained in many allergy medications can have many side effects, one of which is the dilation of the pupil. In rare instances, this can cause an acute glaucoma attack in individuals whose anterior chamber angles are anatomically narrow (narrow-angle glaucoma or angle-closure glaucoma).
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Simply put, it means that the eyeball is very slightly longer than the normal length. With regards to vision, patient with a minus 2 spherical error, has better vision without glasses than a person with minus 5 spherical error has without glasses.
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A person with normal vision will be easily able to see this line from a distance of 18 meters. A person with 6/18 vision will not be able to see this line from 18 meters. ... The commonest condition for reduced vision is refractive error. So glasses should correct the vision to 6/6 or better (best possible is 6/3).
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The glaucoma hemifield test (GHT) is a sensitive indicator of differences between the superior and inferior hemifields. The VFI is an overall marker of field loss similar to the MD.
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When the eye's angle is narrow, it can limit the outflow of fluids, which causes fluid to back up, increasing pressure in the eye. High eye pressure can damage the optic nerve, causing a condition called glaucoma, which may result in vision loss.
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The obtuse angle is the smaller angle. It is more than 90° and less than 180°. The smaller angle is an Obtuse Angle, but the larger angle is a Reflex Angle.
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The term ocular hypertension usually refers to any situation in which the pressure inside the eye, called intraocular pressure, is higher than normal. Eye pressure is measured in millimeters of mercury (mm Hg). Normal eye pressure ranges from 10-21 mm Hg. Ocular hypertension is an eye pressure of greater than 21 mm Hg.
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Antimuscarinics such as atropine are contraindicated in angle-closure glaucoma because of the increased likelihood of producing complete obstruction of the outflow of aqueous humor, resulting in an acute increase in intraocular pressure (IOP) in response to relaxation of the ciliary muscle.
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Measuring Eye Pressure Normal eye pressure ranges from 12-22 mm Hg, and eye pressure of greater than 22 mm Hg is considered higher than normal. When the IOP is higher than normal but the person does not show signs of glaucoma, this is referred to as ocular hypertension. High eye pressure alone does not cause glaucoma.
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A cataract is a change in the lens of the eye; the result is cloudiness as light is prevented from entering the eye properly. Glaucoma is a condition where a buildup of pressure in the eye causes damage to the optic nerve which is the vital link of the eye to the brain which processes visual information.