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What makes a red solution like cherry Kool-aid appear red to your eyeWhat colors of light are absorbed and what colors are transmitted?
Wiki User
∙ 14y ago
Red is reflected. All the rest of the colors hitting the solution are absorbed.
Wiki User
∙ 14y ago
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Boyfriend who's my first kisss and I have made out wz him like 2 times but i get all nervous afterwards and can't even look him in z eyeWhat do you do?
you just have to stay calm and dont worry about being scared cause he probably is scared to
When are abbreviations acceptable Who should use them and why?
They save so much time as one does not have to write the whole word, phrase or sentence. They are useful if the persons who read the abbreviations know what they mean or stand for, like medical personnel take medical terminology to study abbreviations for medical terminology. or engineers study terms for engineering, etc.
Ophthalmoscopy?
DefinitionOphthalmoscopy is an examination of the back part of the eyeball (fundus), which includes the retina, optic disc, choroid, and blood vessels.Alternative NamesFunduscopyHow the test is performedThere are different types of ophthalmoscopy.Direct ophthalmoscopyIndirect ophthalmoscopySlit-lamp ophthalmoscopyDirect ophthalmoscopy: You will be seated in a darkened room. The health care provider performs this common exam by shining a beam of light through the pupil using an instrument called an ophthalmoscope. An ophthalmoscope is about the size of a flashlight. It allows the examiner to view the back of the eyeball.Indirect ophthalmoscopy: You will either lie or sit in a semi-reclined position. The health care provider holds your eye open while shining a very bright light into the eye using an instrument worn on the head. (The instrument looks like a miner's light.) Some pressure may be applied to the eyeball using a small, blunt tool. You will be asked to look in various directions.For information on slit-lamp ophthalmoscopy, see the article: Slit-lamp examOpthalmoscopy examination takes about 5 and 10 minutes.How to prepare for the testIndirect ophthalmoscopy and slit-lamp ophthalmoscopy are performed after eye drops are placed to widen (dilate) the pupils. Direct ophthalmoscopy can be performed with or without dilation of the pupil.The eye drops may make it hard to focus your eyes for several hours. You should arrange to have someone else to drive after the examination. Wearing sunglasses or tinted lenses will help make your dilated pupils more comfortable.You should tell the health care provider if you:Are allergic to any medicationsAre taking any medicationsHave glaucomaor a family history of glaucomaHow the test will feelThe bright light will be uncomfortable, but the test is not painful.You may have a brief sensation of seeing images after the light shines in your eyes. The light is brighter with indirect ophthalmoscopy, so the sensation of seeing after-images may be greater.Pressure put on the eyeball during indirect ophthalmoscopy by may be slightly uncomfortable, but should not be painful.If eyedrops are used, they may produce a brief stinging sensation when placed in the eyes and an unusual taste in the mouth.Why the test is performedOphthalmoscopy is done as part of a routine physical or complete eye examination.It is used to detect and evaluate symptoms of retinal detachment or eye diseases such as glaucoma.Ophthalmoscopy may also be done if you have signs or symptoms of high blood pressure, diabetes, or other diseases that affect the blood vessels.Normal ValuesThe retina, blood vessels, and the optic disc should appear normal.What abnormal results meanAbnormal results may be due to eye diseases such as a detached retina, optic nerve problems, macular degeneration, and changes caused by glaucoma. High blood pressure can also be detected.Additional conditions under which the test may be performed:CMV retinitisDiabetesHypertensive retinopathyMacular degenerationMelanoma of the eyeWhat the risks areThe test itself involves no risk. The dilating eye drops may rarely produce nausea, vomiting, dryness of the mouth, flushing, dizziness, or an attack of narrow-angle glaucoma. If the latter is suspected, drops generally are not used.Special considerationsOphthalmoscopy is considered to be 90-95% accurate and can detect the early stages and effects of many serious diseases.ReferencesYanoff M, Duker JS, Augsburger JJ, et al. eds. Ophthalmology. 2nd ed. St. Louis, Mo: Mosby; 2004:1461-1462.Ruamviboonsuk P, Wongcumchang N, Surawongsin P, Panyawatananukul E, Tiensuwan M. Screening for diabetic retinopathy in rural area using single-field, digital fundus images. J Med Assoc Thai. 2005 Feb;88(2):176-80.
