title: Contrast sensitivity in diabetic pregnancy.
abstract: OBJECTIVE
  To evaluate the correlation between the changes in contrast sensitivity and retinopathy throughout pregnancy in diabetic women with mild background diabetic retinopathy.
  
  
  METHODS
  Contrast sensitivity (Vistech 6500 Contrast Test System) was measured in 22 type I diabetic women with mild background retinopathy [0-16 microaneurysms (MAs)/eye and occasional small intraretinal hemorrhages] and 10 healthy pregnant women at the 12th and 32nd weeks of pregnancy and 3 months after delivery. Red-free fundus photography was also performed at all visits.
  
  
  RESULTS
  Throughout pregnancy contrast sensitivity was lower in the diabetics than in the controls at 1.5, 3.0, and 6.0 cycles per degree (cpd). During the course of pregnancy, contrast sensitivity decreased at 1.5 and 6.0 cpd in patients with more than five new MAs compared to those with fewer than five new MAs during pregnancy. Likewise, contrast sensitivity decreased at 6 cpd in patients with an increase in MA count during pregnancy and at 6 and 12 cpd in patients with a baseline MA count of two or more MAs.
  
  
  CONCLUSIONS
  Contrast sensitivity, especially at low to mid-range spatial frequencies, is decreased in diabetic women with mild retinopathy. Even small changes in retinopathy are reflected in a decrease in contrast sensitivity during and after pregnancy. Thus, contrast sensitivity seems to be a sensitive indicator of changes in minimal background retinopathy.
authors.affiliation: Department of Ophthalmology, Helsinki University Hospital, Finland.
authors.forename: T
authors.initials: T
authors.lastname: Hellstedt
authors.forename: R
authors.initials: R
authors.lastname: Kaaja
authors.forename: K
authors.initials: K
authors.lastname: Teramo
authors.forename: I
authors.initials: I
authors.lastname: Immonen
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000783:Aneurysm / Q000209:etiology / Q000473:pathology / Q000503:physiopathology; D015350:Contrast Sensitivity / Q000502:physiology*; D003922:Diabetes Mellitus, Type 1 / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D003930:Diabetic Retinopathy / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D005865:Gestational Age; D006801:Humans; D049590:Postpartum Period / Q000502:physiology; D011247:Pregnancy; D011254:Pregnancy in Diabetics / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D012160:Retina / Q000473:pathology; D012161:Retinal Artery