Document Detail

Noticeable, troublesome and objectionable limits of blur.
MedLine Citation:
PMID:  15820515     Owner:  NLM     Status:  MEDLINE    
We investigated limits at which induced blur becomes noticeable, troublesome and objectionable. We used 15 cyclopleged subjects, a Badal optometer with lines of three high contrast letters as targets, 3-6 mm artificial pupils, and 0.0-0.7 logMAR letter sizes. For 0.0 logMAR size, mean "noticeable" blur limits were +/-0.33D, +/-0.30D and +/-0.28D at 3 mm, 4 mm and 6 mm, respectively, but increased by about 70% for 0.7 logMAR letters. All limits reduced by about 17% as pupil size increased from 3 mm to 6 mm. Letter size had a significant influence on all blur limits (1.6-2.1 times), but blur direction had no significant effect. Magnitudes of "troublesome" and 'objectionable" limits were 1.6-1.8 times and 2.1-2.5 times relative to "noticeable" limits, respectively. Our results suggest criteria for troublesome and objectionable blur are relatively unaffected by letter size.
David A Atchison; Scott W Fisher; Carol A Pedersen; P Gareth Ridall
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Vision research     Volume:  45     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-04-11     Completed Date:  2005-09-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1967-74     Citation Subset:  IM    
School of Optometry, Queensland University of Technology, Victoria Park Road, Kelvin Grove, QLD 4059, Australia.
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MeSH Terms
Middle Aged
Models, Biological
Optometry / methods
Photic Stimulation / methods
Pupil / physiology
Sensory Thresholds / physiology
Vision Tests / methods
Visual Acuity*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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