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Related to focusing: focussing


the act of converging at a point.
isoelectric focusing electrophoresis in which the protein mixture is subjected to an electric field in a gel medium in which a pH gradient has been established; each protein then migrates until it reaches the site at which the pH is equal to its isoelectric point.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. The point at which rays of light converge after passing through a convex lens to form a real image (real focus), or diverge from (virtual focus) after passing through a concave lens. 2. The centre or starting point of a disease process. 3. To adjust an optical system (e.g. camera or projector) in order to obtain a sharp image. Plural: foci. Syn. focusing. See confocal; principal focus; focal line.
aplanatic foci A pair of conjugate object and image points for which an optical system is free of spherical aberration. Syn. aplanatic points.
dark focus See resting state of accommodation.
depth of focus See depth of focus.
principal focus The axial image point produced by an optical system of an infinitely distant object (the second principal focus or posterior principal focus), or that axial object point for which the image will be formed at infinity (the first principal focus or anterior principal focus). A converging optical system or lens has two principal foci that are real. A diverging optical system or lens has a second principal focus that is virtual. In curved mirrors the two principal foci coincide. Depending upon whether the object is at infinity or at the principal focus, this same focal point becomes either the second principal focus or the first principal focus, respectively. Syn. focal point. See focal length; equivalent power; sign convention.
real focus See focus.
sagittal focus; tangential focus See oblique astigmatism.
virtual focus See focus.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

Patient discussion about focusing

Q. My mind is getting confused now and i am losing on my focus. why is this change happening in me? I am a bipolar for the past 1 year. With the help of the medicines my episodes has come down. My mood is good and stable. Even my friends say that I am well as compared to previous years. But since last week I am not able to sleep well. My disrupted and reduced sleep is making me stressed. I just get 2-3 hours of sleep at night. After my lunch my tiredness starts again. My mind is getting confused now and I am losing on my focus. Why is this change happening in me?

A. There are some possibilities that you are not taking your diet in time or your diet may not be nutritious as per your requirements. This can cause you to have increased stress and you can lose your sleep. This may increase the tiredness. Check if you are taking your medicines in right time. This can also be due to your stress. You may have stress due to your lifestyle too, which needs to be well managed in a healthy way. You can meet your doctor, as any increase in stress due to sleep deprivation can raise the chances of episodes to return back.

Q. Is there a verity of exercises i can do with my child that would be helpful for him to be more focused and relaxed and by that help him to control the ADHD effects ?

A. from our experience - any activity is a good activity...if he feels hyperactive during homework or studying, going out and running around the block will be enough for him. if he can't do that, doing push ups, situps, and even jumping in one place can help- although i must say it is irritating as hell... try practicing also breathing techniques in order to relax.

More discussions about focusing
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References in periodicals archive ?
There were four items on the Extrinsic Goal Orientation subscale, with three items focusing on importance of course grades and one item focusing on the approval of others.
Through these initiatives, the IRS is focusing on IDRs and the appropriate response timeline.
Down the road, I think you'll continue to see 4-H focusing more on what we know from research are the best practices in youth development.
By focusing on a single institution or workgroup, trainers often allow employees to remain singly focused on their immediate co-workers or supervisor, blinded to broader power relationships in which they are party, let alone workers, consumers, and conditions affected by their work.
In addition, participation in academic classes focusing on career interests had significantly increased, particularly in high schools with large African American student populations.
The new technique, temperature gradient focusing, balances the electrophoretic motion of analytes in a microchannel against the bulk flow of buffer solution through the microchannel while applying both an electric field and a temperature gradient along the length of the channel.
Lessig and Arthur provided the hearts of the argument--Arthur focusing on the many justifications for optimism, intellectual property guru Lessig describing some of the concerns that go along with them.
Perhaps the biggest surprise was that the issues people talked about were not the quality-of-care issues that the profession and governmental regulatory bodies spend so much time and energy focusing on.
They have been particularly successful in focusing on the post-Civil War Marvell and in integrating Marvell's later writings, in both verse and prose, into our understanding of his literary achievement.
(5) Typically, the completed performance appraisal form and interview represent an isolated event focusing on the individual employee's performance, independent of the agency's strategy or direction.
When the author expressed ambivalence about the name she had chosen, Family Focus, all the participants saw the dilemma: how was the woman supposed to keep the focus on herself, as a woman, when she had spent her life focusing on her family?
During the past centuries, environmental health and environmental epidemiology have achieved remarkable health gains by focusing on reducing the population's exposure to contaminants in air, water, and soil.