defocus

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de·fo·cus

(dē-fō′kəs)
tr.v. de·fo·cused, de·fo·cus·ing, de·fo·cus·es or de·fo·cussed or de·fo·cus·sing or de·fo·cus·ses
To cause (a beam or a lens) to deviate from accurate focus.
n.
The act or result of causing a lens to deviate from accurate focus.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

defocus

(diːˈfəʊkəs)
vb
formal to go or cause to go out of focus
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
Different from the conventional method, the spot is a complete round with different radiuses according to different defocuses as shown in Figure 3.
A High Precision Laser-Based Autofocus Method Using Biased Image Plane for Microscopy
"What the bat does is it takes clutter and defocuses it, like a camera would, so the target remains highly defined and in focus," he added.
How bats stay on target despite the clutter