Effects of intraocular lens glistenings on visual function: a prospective study and presentation of a new glistenings grading methodology

Nick Stanojcic; David P S O'Brart; Nick Maycock; Chistopher C Hull

doi:10.1136/bmjophth-2018-000266

Effects of intraocular lens glistenings on visual function: a prospective study and presentation of a new glistenings grading methodology

BMJ Open Ophthalmol. 2019 Apr 1;4(1):e000266. doi: 10.1136/bmjophth-2018-000266. eCollection 2019.

Authors

Nick Stanojcic¹, David P S O'Brart¹, Nick Maycock², Chistopher C Hull³

Affiliations

¹ Department of Ophthalmology, St Thomas' Hospital, London, UK.
² Department of Ophthalmology, Queen Alexandra Hospital, Portsmouth, UK.
³ Centre for Applied Vision Research, School of Health Sciences, City, University of London, London, UK.

Abstract

Objective: To investigate the effect of intraocular lens (IOL) glistenings on visual performance and evaluate a new glistenings grading methodology.

Methods and analysis: Thirty-four patients (34 eyes) were recruited. Corrected distance visual acuity (CDVA), mesopic gap acuity (MGA), functional contrast sensitivity (FCS) and forward light scatter were measured (Advanced Vision and Optometric Tests, City Occupational, London, UK). The IOL centre was imaged and glistenings density graded by three observers using the Miyata scale and a new system. Inter-rater reliability, association between the two grading scales, and correlations between glistenings grades and visual performance parameters were evaluated.

Results: The intraclass correlation coefficient between graders for the new grading system was 0.769 (95% Confidence Interval [CI] 0.636 to 0.868). There was a significant association between the Miyata scale and the new grading system for all graders (r_s=0.533-0.895, p≤0.001). There was no association between CDVA or MGA and glistenings grade (r_s=- 0.098, p=0.583 and r_s=0.171, p=0.359, respectively). There was no association between FCS at mesopic light levels and glistenings grade (r_s=-0.032, p=0.864), or the straylight parameter and glistenings grade (r_s=0.021, p=0.916). No association was found between the integrated straylight parameter and glistenings grade (r_s=0.078, p=0.701).

Conclusion: The new glistenings grading scale was highly reproducible. In this cohort, glistenings in the same hydrophobic acrylic IOL after cataract surgery were not associated with changes in visual function, as assessed by a series of tests not previously used in glistenings research.

Keywords: IOL; Light scatter; contrast sensitivity; glistenings; grading scale; intraocular lens implant; lens and zonules; mesopic visual acuity; scotopic visual acuity; visual perception.