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Related Experiment Video

Updated: Jun 16, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
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Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Device for cataract analysis: development and relevance to cataract surgery.

Nobuhiko Chikamoto1, Youichiro Fujitsu, Kazuhiro Kimura

  • 1Department of Ophthalmology, Yamaguchi University Graduate School of Medicine, Ube City, Yamaguchi, Japan. chikamot@yamaguchi-u.ac.jp

Journal of Cataract and Refractive Surgery
|February 2, 2010
PubMed
Summary

A new device accurately grades cataract severity using the World Health Organization (WHO) system, correlating with visual acuity and predicting surgical difficulty for key steps like capsulorhexis and phacoemulsification.

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Area of Science:

  • Ophthalmology
  • Medical Devices
  • Surgical Technology

Background:

  • The World Health Organization (WHO) established a grading system for lens opacity.
  • Accurate preoperative assessment of cataract severity is crucial for surgical planning.

Purpose of the Study:

  • To assess the correlation between WHO cataract grades obtained with a novel device and preoperative visual acuity.
  • To determine if the device can predict the difficulty of specific cataract surgery steps.

Main Methods:

  • A prospective study evaluated 64 eyes using the Konan Anterior Segment Tri Camera System 1000 for WHO cataract grading.
  • Preoperative visual acuity, continuous curvilinear capsulorhexis (CCC) time, irrigation/aspiration (I/A) time, and effective phaco time (EPT) were measured.

Related Experiment Videos

Last Updated: Jun 16, 2026

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Main Results:

  • Higher posterior subcapsular cataract (PSC) grades significantly correlated with decreased visual acuity (P<.01).
  • Cataract severity scores (nuclear + cortical + PSC) showed significant differences in visual acuity across mild, moderate, and severe grades.
  • Cortical (COR) cataract grades correlated with increased CCC and I/A times, while nuclear (NUC) grades correlated with increased EPT.

Conclusions:

  • The WHO grading device effectively identifies lens opacities and predicts potential surgical challenges.
  • This device shows promise for improving cataract surgery planning and resident training.