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"Bothersome blur": a functional unit of blur perception.
Kenneth J Ciuffreda1, Arkady Selenow, Bin Wang
1SUNY/State College of Optometry, Department of Vision Sciences, New York, NY 10036, USA. kciuffreda@sunyopt.edu
Vision Research
|December 13, 2005
Summary
Understanding how much blur is bothersome is key for vision correction. This study found that the amount of blur considered annoying depends mainly on the target
Area of Science:
- Optometry
- Vision Science
- Ophthalmology
Background:
- Limited knowledge exists on the threshold of blur that is perceived as bothersome and impacts visual task performance.
- Defining "bothersome blur" is crucial for optical design and refractive surgery outcomes.
Purpose of the Study:
- To quantify the dioptric thresholds for blur detection, bothersome blur, and non-resolvable blur.
- To investigate the influence of target characteristics (detail and extent) on these blur thresholds.
- To assess the repeatability of bothersome blur thresholds.
Main Methods:
- A Badal optical system was used for monocular measurements.
- Participants included visually normal young adults and absolute presbyopes.
- Targets varied: isolated Snellen E (20/50, 20/200) and 20/50 text lines.
Main Results:
- Bothersome blur thresholds were consistently higher than detection thresholds and lower than non-resolvable blur thresholds.
- Thresholds for 20/50 isolated E and 20/50 text were similar, but lower than for 20/200 E.
- Results were consistent across young adults and presbyopes, with good repeatability in young adults.
Conclusions:
- Bothersome blur perception is primarily influenced by target detail and secondarily by target extent.
- Findings provide critical data for optical lens design tolerances and refractive surgery outcome expectations.
- This research offers insights into fundamental human blur perception mechanisms.