Persistent biases in subjective image focus following cataract surgery

Khatuna Parkosadze, Teona Kalmakhelidze, Marina Tolmacheva, Georgi Chichua, Archil Kezeli, Michael A. Webster, John S Werner

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We explored the perception of image focus in patients with cataracts, and how this perception changed following cataract removal and implantation of an intraocular lens. Thirty-three patients with immature senile cataract and with normal retinal function were tested before surgery and 2. days after surgery, with 18 of the patients retested again at 2. months following surgery. The subjective focus of natural images was quantified in each session by varying the slope of the image amplitude spectra. At each time, short-term adaptation to the spectral slope was also determined by repeating the measurements after exposure to images with blurred or sharpened spectra. Despite pronounced acuity deficits, before surgery images appeared "best-focused" when they were only slightly blurred, consistent with a strong compensation for the acuity losses. Post-operatively, the image slopes that were judged "in focus" before surgery appeared too sharp. This bias remained strong at 2. months, and was independent of the rapid blur aftereffects induced by viewing filtered images. The focus settings tended to renormalize more rapidly in patients with higher post-operative acuity, while acuity differences were unrelated to the magnitude of the short-term blur aftereffects. Our results suggest that subjective judgments of image focus are largely compensated as cataracts develop, but potentially through a very long-term form of adaptation that results in persistent biases after the cataract is removed.

Original languageEnglish (US)
Pages (from-to)10-17
Number of pages8
JournalVision Research
Volume89
DOIs
StatePublished - Aug 30 2013

Fingerprint

Cataract
Intraocular Lens Implantation
Ambulatory Surgical Procedures

Keywords

  • Blur adaptation
  • Cataract
  • Spatial vision

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Cite this

Parkosadze, K., Kalmakhelidze, T., Tolmacheva, M., Chichua, G., Kezeli, A., Webster, M. A., & Werner, J. S. (2013). Persistent biases in subjective image focus following cataract surgery. Vision Research, 89, 10-17. https://doi.org/10.1016/j.visres.2013.06.008

Persistent biases in subjective image focus following cataract surgery. / Parkosadze, Khatuna; Kalmakhelidze, Teona; Tolmacheva, Marina; Chichua, Georgi; Kezeli, Archil; Webster, Michael A.; Werner, John S.

In: Vision Research, Vol. 89, 30.08.2013, p. 10-17.

Research output: Contribution to journalArticle

Parkosadze, K, Kalmakhelidze, T, Tolmacheva, M, Chichua, G, Kezeli, A, Webster, MA & Werner, JS 2013, 'Persistent biases in subjective image focus following cataract surgery', Vision Research, vol. 89, pp. 10-17. https://doi.org/10.1016/j.visres.2013.06.008
Parkosadze K, Kalmakhelidze T, Tolmacheva M, Chichua G, Kezeli A, Webster MA et al. Persistent biases in subjective image focus following cataract surgery. Vision Research. 2013 Aug 30;89:10-17. https://doi.org/10.1016/j.visres.2013.06.008
Parkosadze, Khatuna ; Kalmakhelidze, Teona ; Tolmacheva, Marina ; Chichua, Georgi ; Kezeli, Archil ; Webster, Michael A. ; Werner, John S. / Persistent biases in subjective image focus following cataract surgery. In: Vision Research. 2013 ; Vol. 89. pp. 10-17.
@article{a08f11bbdacd463d99f12a52387501e6,
title = "Persistent biases in subjective image focus following cataract surgery",
abstract = "We explored the perception of image focus in patients with cataracts, and how this perception changed following cataract removal and implantation of an intraocular lens. Thirty-three patients with immature senile cataract and with normal retinal function were tested before surgery and 2. days after surgery, with 18 of the patients retested again at 2. months following surgery. The subjective focus of natural images was quantified in each session by varying the slope of the image amplitude spectra. At each time, short-term adaptation to the spectral slope was also determined by repeating the measurements after exposure to images with blurred or sharpened spectra. Despite pronounced acuity deficits, before surgery images appeared {"}best-focused{"} when they were only slightly blurred, consistent with a strong compensation for the acuity losses. Post-operatively, the image slopes that were judged {"}in focus{"} before surgery appeared too sharp. This bias remained strong at 2. months, and was independent of the rapid blur aftereffects induced by viewing filtered images. The focus settings tended to renormalize more rapidly in patients with higher post-operative acuity, while acuity differences were unrelated to the magnitude of the short-term blur aftereffects. Our results suggest that subjective judgments of image focus are largely compensated as cataracts develop, but potentially through a very long-term form of adaptation that results in persistent biases after the cataract is removed.",
keywords = "Blur adaptation, Cataract, Spatial vision",
author = "Khatuna Parkosadze and Teona Kalmakhelidze and Marina Tolmacheva and Georgi Chichua and Archil Kezeli and Webster, {Michael A.} and Werner, {John S}",
year = "2013",
month = "8",
day = "30",
doi = "10.1016/j.visres.2013.06.008",
language = "English (US)",
volume = "89",
pages = "10--17",
journal = "Vision Research",
issn = "0042-6989",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Persistent biases in subjective image focus following cataract surgery

AU - Parkosadze, Khatuna

AU - Kalmakhelidze, Teona

AU - Tolmacheva, Marina

AU - Chichua, Georgi

AU - Kezeli, Archil

AU - Webster, Michael A.

AU - Werner, John S

PY - 2013/8/30

Y1 - 2013/8/30

N2 - We explored the perception of image focus in patients with cataracts, and how this perception changed following cataract removal and implantation of an intraocular lens. Thirty-three patients with immature senile cataract and with normal retinal function were tested before surgery and 2. days after surgery, with 18 of the patients retested again at 2. months following surgery. The subjective focus of natural images was quantified in each session by varying the slope of the image amplitude spectra. At each time, short-term adaptation to the spectral slope was also determined by repeating the measurements after exposure to images with blurred or sharpened spectra. Despite pronounced acuity deficits, before surgery images appeared "best-focused" when they were only slightly blurred, consistent with a strong compensation for the acuity losses. Post-operatively, the image slopes that were judged "in focus" before surgery appeared too sharp. This bias remained strong at 2. months, and was independent of the rapid blur aftereffects induced by viewing filtered images. The focus settings tended to renormalize more rapidly in patients with higher post-operative acuity, while acuity differences were unrelated to the magnitude of the short-term blur aftereffects. Our results suggest that subjective judgments of image focus are largely compensated as cataracts develop, but potentially through a very long-term form of adaptation that results in persistent biases after the cataract is removed.

AB - We explored the perception of image focus in patients with cataracts, and how this perception changed following cataract removal and implantation of an intraocular lens. Thirty-three patients with immature senile cataract and with normal retinal function were tested before surgery and 2. days after surgery, with 18 of the patients retested again at 2. months following surgery. The subjective focus of natural images was quantified in each session by varying the slope of the image amplitude spectra. At each time, short-term adaptation to the spectral slope was also determined by repeating the measurements after exposure to images with blurred or sharpened spectra. Despite pronounced acuity deficits, before surgery images appeared "best-focused" when they were only slightly blurred, consistent with a strong compensation for the acuity losses. Post-operatively, the image slopes that were judged "in focus" before surgery appeared too sharp. This bias remained strong at 2. months, and was independent of the rapid blur aftereffects induced by viewing filtered images. The focus settings tended to renormalize more rapidly in patients with higher post-operative acuity, while acuity differences were unrelated to the magnitude of the short-term blur aftereffects. Our results suggest that subjective judgments of image focus are largely compensated as cataracts develop, but potentially through a very long-term form of adaptation that results in persistent biases after the cataract is removed.

KW - Blur adaptation

KW - Cataract

KW - Spatial vision

UR - http://www.scopus.com/inward/record.url?scp=84880936557&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84880936557&partnerID=8YFLogxK

U2 - 10.1016/j.visres.2013.06.008

DO - 10.1016/j.visres.2013.06.008

M3 - Article

VL - 89

SP - 10

EP - 17

JO - Vision Research

JF - Vision Research

SN - 0042-6989

ER -