Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Recognition thresholds for letters with simulated dioptric blur.

H Akutsu1, H E Bedell, S S Patel

  • 1University of Ilowa, Department of Neurology, Iowa City, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|December 2, 2000
PubMed
Summary

Dioptric blur impairs visual acuity by limiting spatial frequency information. This study found that phase-rectified filtering improved letter recognition, suggesting blur

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Whole genome sequencing and characteristics of extended-spectrum beta-lactamase producing <i>Escherichia coli</i> isolated from poultry farms in Banaskantha, India.

Frontiers in microbiology·2022
Same author

Visuomotor control in mice and primates.

Neuroscience and biobehavioral reviews·2021
Same author

Technique to manage intraoperative cuff leak from damaged endotracheal tube pilot balloon.

International journal of oral and maxillofacial surgery·2021
Same author

Anisotropic Fully Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex.

Physical review letters·2020
Same author

Aneuploid rescue precedes X-chromosome inactivation and increases the incidence of its skewness by reducing the size of the embryonic progenitor cell pool.

Human reproduction (Oxford, England)·2019
Same author

Metagenomic of clinically diseased and healthy broiler affected with respiratory disease complex.

Data in brief·2018

Area of Science:

  • Optics
  • Vision Science
  • Image Processing

Background:

  • Dioptric blur is a common cause of reduced visual acuity.
  • The modulation transfer function (MTF) describes how optical systems degrade image contrast at different spatial frequencies.

Purpose of the Study:

  • To investigate the impact of simulated dioptric blur on visual acuity.
  • To determine which components of the modulation transfer function (MTF) are critical for letter recognition.

Main Methods:

  • Digitally filtered Sloan optotype letters (C, D, E, O, S) were used to simulate dioptric blur.
  • Four filter types were applied: normal, truncated, phase-rectified, and truncated-plus-negative.
  • Letter size for 60% correct identification was measured for simulated +1, +2, and +4 D blur.

Related Experiment Videos

Main Results:

  • Normal, truncated, and truncated-plus-negative filtering resulted in similar visual acuity thresholds.
  • Phase-rectified filtering yielded significantly better acuity thresholds.
  • Acuity thresholds were consistent with critical information being below the first zero of the MTF.

Conclusions:

  • Dioptric blur degrades visual acuity primarily by limiting useful spatial frequency information below the MTF's first zero.
  • Phase-reversed spatial frequency information above the MTF's first zero does not significantly interfere with letter recognition.
  • Critical information for letter acuity appears to be concentrated at approximately 1.5 cycles/letter.