title: Luminance contrast with clear and yellow-tinted intraocular lenses.
abstract: OBJECTIVE
  To determine whether yellow-tinted intraocular lenses (IOLs) negatively affect luminance contrast in postoperative cataract patients.
  
  
  METHODS
  Department of Ophthalmology, Sir Mortimer B. Davis Jewish General Hospital, McGill University, Montreal, Quebec, Canada.
  
  
  METHODS
  Luminance contrast was measured using the minimum-motion technique. The stimulus consisted of blue and red sinusoidal gratings differing in luminance. Patients had implantation of a clear or yellow-tinted IOL and were tested monocularly 2 to 9 weeks after cataract surgery. No patient had concomitant ocular diseases or congenital color defects, assessed by their ophthalmologist, or flicker-sensitive epilepsy. All patients had a visual acuity of 20/40 or better a mean of 4 weeks+/-2 (SD) postoperatively.
  
  
  RESULTS
  Patients ranged in age from 55 to 89 years. An independent-samples Student t test showed that patients with a yellow-tinted IOL had significantly lower luminance contrast values than patients with a clear IOL (P<.05).
  
  
  CONCLUSIONS
  The results suggest that yellow-tinted IOLs affect the perception of luminance under photopic conditions. More blue light was required to make luminance judgments with a yellow-tinted IOL than with a clear IOL. Further study of the functional impact of luminance reduction by yellow-tinted IOLs is warranted.
authors.affiliation: Department of Psychiatry, McGill University Institute of Community and Family Psychiatry, and Department of Ophthalmology, Sir Mortimer B. Davis Jewish General Hospital, Montreal, Quebec, Canada. andrena@sympatico.ca
authors.forename: Andrena
authors.initials: A
authors.lastname: Pierre
authors.forename: Walter
authors.initials: W
authors.lastname: Wittich
authors.forename: Jocelyn
authors.initials: J
authors.lastname: Faubert
authors.forename: Olga
authors.initials: O
authors.lastname: Overbury
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008027:Light; D008875:Middle Aged; D010468:Perceptual Disorders / Q000209:etiology / Q000503:physiopathology*; D018918:Phacoemulsification; D011474:Prosthesis Design; D019591:Pseudophakia / Q000503:physiopathology*; D014792:Visual Acuity