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Doctor insights on: Sensitivity Of Optical Colonoscopy

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What are the uses and?Side effects of oct (optical coherence tomography) test of eye?

What are the uses and?Side effects of oct (optical coherence tomography) test of eye?

Versatile: The oct is a magnificent piece of equipment that is capable of many uses. It can be used in glaucoma to measure the size of the angle and to measure the thickness of the layer of tissue around the optic nerve. It is also useful in many different types of retinal disease. There are no side effects to the test itself, in some instances, your eye may have to be dilated to take it. ...Read more

Dr. Charles Cattano
2,042 doctors shared insights

Colonoscopy (Definition)

Colonoscopy is the procedure of using a long flexible camera to visualize the entire colon from the inside with the option to take pictures, video, perform biopsies, remove polyps, etc. Generally people are sedated and do ...Read more


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Describe near infrared raman spectroscopy for optical diagnosis of cancer?

Describe near infrared raman spectroscopy for optical diagnosis of cancer?

Laser Diagnosis: Raman spectroscopy can be used in the non-invasive diagnosis of skin cancers, with a high degree of accuracy. The technology is complicated, but it is used to detect the shift in light transmission when a superficial laser beam passed over a lesion in the skin encounters molecules from a dense cluster of cells with a high dna content, as would be present in a skin cancer. ...Read more

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Can CT scan clearly pin point the location of colon perforation and determine the size of the hole, using color contrast drink?

Can CT scan clearly pin point the location of colon perforation and determine the size of the hole, using color contrast drink?

Sometimes : If the perforation is large enough, and the oral contrast is in that loop of bowel, then yes. A very small hole may not be seen that way, but the ct will show air that has leaked out of the bowel, which can help the surgeons if an open repair is required. ...Read more

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What are the tests for detecting early onset glaucoma?Does retinal examination help?Iot:18 both eyes.Feel contrast loss at night.Doc said lent opacity

What are the tests for detecting early onset glaucoma?Does retinal examination help?Iot:18 both eyes.Feel contrast loss at night.Doc said lent opacity

Testing: Glaucoma is not the most common cause of loss of contrast at night. Visual field or oct testing can be done to detect early glaucoma, but with normal pressures such as yours and a normal exam, i would not expect them to show glaucoma. Those tests are usually done in patients that show physical signs of possible glaucoma such as elevated pressures or cupping of the optic nerve. ...Read more

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Fibre length, overall signal attenuation for an optical link, coupling loss exam, what are these?

Fibre length, overall signal attenuation for an optical link, coupling loss exam, what are these?

Non-medical: These are terms out of fiber optic technology relating to the signal loss related to length of the fiber, loss jumping the gap between two fibers juxtaposed and loss from characteristics of the optical fiber. ...Read more

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What is the risk of bowel perforation from CT colonography "virtual colonoscopy"??

What is the risk of bowel perforation from CT colonography "virtual colonoscopy"??

Not invasive.: A traditional colonoscopy is invasive; the fiber optic camera is passed through the colon, and therein causes the low risk of perforation of the colon. A CT colonography is not invasive; it's just a fancier CT scan, so there's nothing to directly cause a perforation. ...Read more

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Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Usually it is fine: You have defects in the central visual portion of your field of view - an area poorly outlined by most field testing devices. Field tests will define major defects which largely will register from the peripheral areas tested. Have you had a field tested in the past? Is there some condition being sought for with a field.? Your ophthalmologist would not order a field if he doubts the result. ...Read more

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Are there errors, distortions, or disadvantages of using a mirror in a visual acuity test?

Are there errors, distortions, or disadvantages of using a mirror in a visual acuity test?

No: No, the image is the same as if you were looking the entire 20 feet (or 6 meters). The virtual image produced by the mirror is 20 feet away. Now, if the mirror is very dirty or dusty, maybe. ...Read more

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Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?

Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?

Yes: It is important that your eye pressure be monitored closely and that the visual fields and oct are tested are a regular basis. I suggest you see an ophthalmologist regularly. There are usually no symptoms of glaucoma that you will experience. ...Read more

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Does the eye surgery to take out floaters involve side effects of light sensitivity and vision distortion?

Does the eye surgery to take out floaters involve side effects of light sensitivity and vision distortion?

Surgery?: Floaters are not generally treated with surgery unless associated with retinal detachment or surface wrinkling retinopathy. Laser has been used to break up annoying large floaters leaving annoying small floaters instead. As floaters are usually not harmful, and time usually results in dissipation and less annoyance, they are mostly left alone. Vitreous surgery can cause distortion and discomfort. ...Read more

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YAG iridotomy at 12 o'clock position. Have ghost images in lower field of vision. Looks kind of like a line/crescent of light Will these resolve?

YAG  iridotomy at 12 o'clock position.  Have ghost images in lower field of vision.  Looks kind of like a line/crescent of light Will these resolve?

Most often yes: Sometimes no, if it does not, please look into a corneal tattoo (rarely needed but works very well to block the extra light coming through or colored contact lens. ...Read more

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I have a refractive error of -5.75 in both eyes (myopia & astigmatism) and floaters in both eyes. Is a pupil dilation better than the digital retinal?

I have a refractive error of -5.75 in both eyes (myopia & astigmatism) and floaters in both eyes. Is a pupil dilation better than the digital retinal?

Yes: Nothing beats the chance to get a good look at the peripheral retina when there is an onset of new floaters. Dilation is a bit of an annoying pain but is recommended in this circumstance. You are, hopefully, seeing an ophthalmologist. ...Read more

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Uc flare with thin stools, chunks of blood in stool, and frequency. Egd, colonoscopy, biopsies & digital perianal & rectal exam all normal. confused?

Uc flare with thin stools, chunks of blood in stool, and frequency. Egd, colonoscopy, biopsies & digital perianal & rectal exam all normal. confused?

UC is long-term: Ulcerative colitis is a lifelong inflammatory disease of the lining of the large intestine and rectum, that may have systemic consequences, is often relapsing, and can lead to colon cancer. Flares may occur acutely, even after an unremarkable colon evaluation. Don't delay in ruling out superimposed infection, & seeking help from your gastroenterologist. Call him/her now-- ...Read more

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What are the differences between sigmoidoscopy prep and colonoscopy prep?

What are the differences between sigmoidoscopy prep and colonoscopy prep?

It is similar: Both procedures require complete cleaning up of the Colorectal area. So the prep is not any different. ...Read more

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Can CT with rectal and IV contrast rule out small polyps or lessions in the colon?proctoscope and rectal exam are clean.no blood in stool.

Can CT with rectal and IV contrast rule out small polyps or lessions in the colon?proctoscope and rectal exam are clean.no blood in stool.

Small polyps: would be very difficult to diagnose on such an exam. A tailored "CT Colonography" would be better. Standard colonoscopy would be best. ...Read more

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Can stool in the colon cause a pet scan to light up?

Can stool in the colon cause a pet scan to light up?

No: There is variable uptake throughout the bowel on pet scans due to a number of factors (e.g., bowel motility, types of cells in the bowel or inflammation). It is not uncommon to have areas of focal uptake in the bowel. Stool, per se, should not cause increased uptake, though bowel activity may lead to a focal "hot spot.". ...Read more

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Eye sight degraded,MR venography shows narrowing to full occlusion of transverse and sigmoid sinuses,feeling headache in left back of head?

Eye sight degraded,MR venography shows narrowing to full occlusion of transverse and sigmoid sinuses,feeling headache in left back of head?

To the ER: I assume if you had MR venography that shows narrowing to full occlusion you have already saught care. this can be related to a cavernous sinus thrombosis which is severe vision threatening condition. please make sure you follow all the guidelines set out by your physicians. Good luck ...Read more