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blur

 
lack of sharpness in an x-ray image, usually due to patient motion.

blur

(blur) indistinctness, clouding, or fogging.
spectacle blur  the indistinct vision with spectacles occurring after removal of contact lenses, especially non–gas-permeable lenses; it is believed to result from chronic corneal hypoxia and edema.

blur 

1. Degradation of an image formed by an optical system as a result of lack of focusing, aberrations, diffusion of light, etc.
2. A pattern in which the border is indistinct. See lens flare; blurred vision.
blur back test See plus 1.00 D blur test.
blur circle A circular patch of light formed on the retina resulting from a point object whose image is focused either in front of, or behind the retina, or due to excessive aberrations of the optical system of the eye. The size of the blur circle increases with the distance of the ocular image from the retina and with the diameter of the pupil. Its diameter can be expressed in angular terms (in min arc) as
α = 3.48 ✕ ΧFd
where ΧF is the defocus (in dioptres) with respect to the object point, and d the pupil diameter (in mm) (Figs. B4 and B5). Example: An object at infinity is viewed by a 2 D uncorrected myope with a 4.0 mm pupil diameter, i.e. α = 3.48 ✕ 2 ✕ 4 = 28 min arc. Syn. circle of confusion; circle of diffusion. See aberration; depth of field.
plus 1.00D blur test See plus 1.00 D blur test.
blur point See blur point.
spectacle blur Reduction in visual acuity noticed with spectacles after removal of hard contact lenses (PMMA). This may be due to corneal oedema, alteration of the corneal index of refraction, surface distortion of the cornea, etc. Refitting the patient with gas permeable lenses usually relieves this symptom.
Fig. B4 Blur circle corresponding to an image formed in front of the retinaenlarge picture
Fig. B4 Blur circle corresponding to an image formed in front of the retina
Fig. B5 Effect of pupil size on the blur circle. O9 is the image of object O formed by the optics of the eyeenlarge picture
Fig. B5 Effect of pupil size on the blur circle. O9 is the image of object O formed by the optics of the eye

blur

lack of clarity in the radiograph caused by movement of the x-ray tube, subject or film during exposure.

Patient discussion about blur

Q. My vision is blurry and I see zigzag lines, what is it from? Every now and again, usually after sitting a few hours in front of the computer or not sleeping enough at night, I start getting blurry vision. I see zigzag lines in front of my eyes and it can take sometimes an hour to go away. What is this from?

A. It sounds like you have a migraine. A migraine that comes with blurry vision and zigzags (an aura) is called a classic migraine. The aura of migraine typically lasts from 20 minutes to an hour. Some patients have prolonged aura symptoms that can last hours to days. The aura also typically ends before the headache itself begins. When migraine aura symptoms are prolonged or last into or through the headache phase these types of migraine are commonly referred to as complicated migraines.

Q. I have fibromyalgia and am having terrible vision problems...double, blurred, feel off blance.Is this common?

A. Blurry vision is not a usual symptom in fibromyalgia. If you are experiencing this on a permenant basis you should see a doctor- either a neurologist or an ophthalmologist to rule out other vision conditions that might be causing this.

Q. What are the sides effects of alcoholism beside dizziness and blur?

A. In the short term, excessive alcohol consumption may cause vomiting and metabolic disturbances, seizures and coma. In the long term, alcohol may damage the pancreas, liver and other organs, and expose to cancer of the mouth.

You may read more here:
www.nlm.nih.gov/medlineplus/alcoholism.html

More discussions about blur
References in periodicals archive ?
Users experiencing blurry photos taken with their iSight
They also said that the volunteers who watched the charity advertisement donated more money to the charity, but only after seeing the blurry, difficult to read ad.
It could take a range of photos indoors and then show me what I had so I could delete all the clear shots and save only the blurry.
The top 10 from Liverpool HMV this week is: 1 Dove (I'll Be Loving You) - Moony 2 Blurry - Puddle of Mudd 3 Light My Fire - Will Young 4 Without Me - Eminem 5 Sweetness - Jimmy Eat World 6 Be Cool - Paffendorf 7 Hella Good - No Doubt 8 We're On The Ball - Ant and Dec 9 Jump On Demand - Spunge 10 Stop Playing Guitar - Promise Ring Win a chart album of your choice by telling me the name of the lead singer of No Doubt.
The first photo shows a small, blurry white object near the upper right corner - possibly the plane just a few feet above the ground.
Soft, blurry edges make the pattern tough to focus on, and the open pattern doesn't get dark when viewed from a distance.
When you are moving and you try to take a photograph of yourself, it's blurry because you're evolving a lot.
This is where the role of outside observer and inside participant becomes blurry.
It took longer to board, as passengers were stripped of glasses, beepers, cell phones, loose shoes, bags and cameras before being firmly strapped into one of a dozen open air seats and quietly swooshed up at 45 miles an hour for a blurry view of the Twin Towers and Long Island Sound.
RELATED ARTICLE: Refractive Conditions--Eyes in which sight is blurry due to light rays not being brought to a clear focus on the retina.
Fuzzy or blurry vision is caused when objects we see do not fall where they should on our retina.
Here's Whitehead on fathering outside of marriage: "The boundaries between physical caretaking and sexual abuse, innocent tussling and exploitative fondling, have become blurry and ill defined.