April 2010
Volume 51, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2010
Relationship Between Visual Acuity, Pupil Size and Refractive Difference in Pseudophakic Monovision
Author Affiliations & Notes
  • T. Kawamorita
    Orthoptics and Visual Science, Kitasato University School, Sagamihara-shi, Japan
  • H. Uozato
    Orthoptics and Visual Science, Kitasato University School, Sagamihara-shi, Japan
  • N. Nakayama
    Ophthalmology and Visual Science, Kitasato University Graduate School, Sagamihara-shi, Japan
  • M. Shindo
    Ophthalmology and Visual Science, Kitasato University Graduate School, Sagamihara-shi, Japan
  • T. Hannda
    Orthoptics and Visual Science, Kitasato University School, Sagamihara-shi, Japan
  • M. Ito
    Orthoptics and Visual Science, Kitasato University School, Sagamihara-shi, Japan
  • K. Shimizu
    Ophthalmology, Kitasato University School of Medicine, Sagamihara-shi, Japan
  • Footnotes
    Commercial Relationships  T. Kawamorita, None; H. Uozato, None; N. Nakayama, None; M. Shindo, None; T. Hannda, None; M. Ito, None; K. Shimizu, None.
  • Footnotes
    Support  a grant from Kitasato University School of Allied Health Sciences (Grant-in-Aid for Research Project, No. 2009-6558) (T. K.)
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 3966. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      T. Kawamorita, H. Uozato, N. Nakayama, M. Shindo, T. Hannda, M. Ito, K. Shimizu; Relationship Between Visual Acuity, Pupil Size and Refractive Difference in Pseudophakic Monovision. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3966.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Purpose: : To investigate the relationship between pupil size and estimated visual acuity in pseudophakic monovision with ray tracing.

Methods: : For the simulation, a modified Liou-Brennan model eye was used. The model eye was designed to include a centered optical system, corneal asphericity, a pupil, a Stiles-Crawford effect, an intraocular lens, and chromatic aberration. Calculation of the modulation transfer function (MTF) was performed with ZEMAX software. Visual acuity was estimated from the MTF and the retinal threshold curve. The sizes of the entrance pupil were 2.0, 2.5, 3.0, and 4.0 mm.

Results: : Decreasing pupil diameter and increasing myopia progressively improved near visual acuity. For an entrance pupil size of 2.5-mm and a refractive difference of 1.5 D, the estimated visual acuities were 0.1 logMAR or better from far to a distance of 40 cm, and the estimated logMAR value (Snellen; metric) in the non-dominant eye at 40 cm was 0.06 (20/23; 6/6.9).

Conclusions: : Our results would be of use to help predict visual acuity when using the pseudophakic monovision technique and to determine the optimum refractive difference from pupil size. Also, in cases of patients with a pupil size less 2.5 mm, a 1.5 D interocular difference in refractive error is effective for patients who have a near visual acuity of approximately 0.1 logMAR and excellent intermediate visual acuity.

Keywords: visual acuity • presbyopia • pupil 
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×