Tritan colour contrast sensitivity function in refractive multifocal intraocular lenses

• Published in: British journal of ophthalmology Vol. 85; no. 7; pp. 811 - 815
• Main Authors: Pieh, Stefan, Hanselmayer, Georg, Lackner, Birgit, Marvan, Patrick, Grechenig, Andreas, Weghaupt, Herbert, Vass, Clemens, Skorpik, Christian
• Format: Journal Article
• Language: English
• Published: BMA House, Tavistock Square, London, WC1H 9JR BMJ Publishing Group Ltd 01.07.2001; BMJ; BMJ Publishing Group LTD
• Subjects: Aged; Aged, 80 and over; Biological and medical sciences; Color Perception; Contrast Sensitivity; Contrast sensitivity (Vision); Diagnosis, Computer-Assisted; Fixation, Ocular; Graphs; Humans; Intraocular lenses; Lenses, Intraocular; Medical sciences; Middle Aged; multifocal intraocular lenses; Ophthalmology - instrumentation; Ophthalmology - methods; Optics; Patients; Scientific Correspondence; Statistics, Nonparametric; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Surgery of the eye and orbit; Testing; tritan colour contrast sensitivity; Vision systems; Visual Acuity; United Kingdom; Human; Eye; Multifocal lens; Sensitivity; Glare; Surgery; Color; Monofocal lens; Intraocular lens; Contrast; Comparative study
• ISSN: 0007-1161; 1468-2079
• DOI: 10.1136/bjo.85.7.811

AIMS To compare tritan colour contrast sensitivity (CCS), without and with glare, in patients with refractive multifocal intraocular lenses (IOLs) and with monofocal intraocular lenses. METHODS Tritan CCS was determined (Moorfields Vision System, CH Electronics) in 15 eyes (14 patients, 75.7 (±6.6) years) with a refractive multifocal IOL (Allergan SA 40N) and in 11 eyes (10 patients, 73.7 (±6.4) years) with a monofocal IOL (Allergan SI 40 NB). Measurements were made monocularly under mesopic conditions at a distance of 2 metres from the monitor with best distance refraction plus 0.5 D at 0.5, 1, 3, 6, 11.4, and 22.8 cycles per degree (cpd). The test was then repeated for the multifocal IOLs, adding minus 2.5 D to the best distance refraction to force the patient to use the near focus. Both lenses were also investigated under glare conditions with the same set-up and using the brightness acuity tester (BAT). RESULTS The tritan CCS function without glare in multifocal lenses through the distance focus was nearly identical to that through the near focus. The following statistically significant differences were measured: the CCS function without glare for the multifocal lens was worse at 0.5 cpd and 1.0 cpd than that of the monofocal lens. In CCS testing of the multifocal group with glare at 6 cpd, the results through the distance focus were better than the results through the near focus. For the CCS function with glare, the values for the distance focus in the multifocal lens were worse than the values for the monofocal lens at 0.5 cpd and 1 cpd. In CCS testing with glare through the near focus and CCS testing through the monofocal lens, the monofocal lens performed better at 0.5 cpd, 1 cpd, 3 cpd, and 6 cpd. CONCLUSION Refractive multifocal intraocular lenses influence tritan CCS function compared to monofocal lenses.