title: Macular Telangiectasia Type 1: Capillary Density and Microvascular Abnormalities Assessed by Optical Coherence Tomography Angiography.
abstract: OBJECTIVE
  To describe microvascular abnormalities and capillary density in macular telangiectasia type 1 (MT1) using optical coherence tomography angiography (OCTA), and correlate them with fluorescein angiography (FA).
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  Seven patients with MT1 and 12 age-matched controls were included. Focal microvascular dilations were identified on 3 × 3 mm OCTA and early-frame FA images. OCTA images were processed to determine the global capillary density after subtraction of larger vessels and cystoid edema cavities. Local capillary densities were calculated inside 100-μm circles around telangiectasias, projected over superficial (SCP) and deep capillary plexuses (DCP). They were compared to a random sample of 100-μm circles generated in each OCTA image. FA images were processed to measure mean perifoveal intercapillary areas (PIA), inversely reflecting capillary density.
  
  
  RESULTS
  In MT1 eyes, fewer telangiectasias were identified with OCTA than with FA (P = .016), exclusively localized in the DCP (P = .016). Rarefaction of both capillary plexus and abnormal microvascular morphology were better identified by OCTA than by FA. The global capillary density on OCTA was significantly lower in MT1 eyes than in fellow and control eyes, respectively: SCP, 0.347 vs 0.513 (P = .004) and 0.560 (P = .0005); DCP, 0.357 vs 0.682 (P = .016) and 0.672 (P = .0005). Capillary density was significantly reduced around telangiectasias in both SCP (P = .021) and DCP (P = .042). Capillary density of the SCP correlated inversely with the mean PIA on FA (r = -0.94, P = .017). LogMAR visual acuity was inversely correlated with SCP (r = -0.88, P = .012) and DCP capillary densities (r = -0.79, P = .048).
  
  
  CONCLUSIONS
  OCTA confirmed that global and focal capillary depletion is associated with MT1.
authors.affiliation: Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital. Fondation Asile des Aveugles, Lausanne, Switzerland.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Matet
authors.affiliation: Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital. Fondation Asile des Aveugles, Lausanne, Switzerland.
authors.forename: Alejandra
authors.initials: A
authors.lastname: Daruich
authors.affiliation: Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital. Fondation Asile des Aveugles, Lausanne, Switzerland.
authors.forename: Ali
authors.initials: A
authors.lastname: Dirani
authors.affiliation: Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital. Fondation Asile des Aveugles, Lausanne, Switzerland.
authors.forename: Aude
authors.initials: A
authors.lastname: Ambresin
authors.affiliation: Department of Ophthalmology, University of Lausanne, Jules-Gonin Eye Hospital. Fondation Asile des Aveugles, Lausanne, Switzerland; Inserm, U1138, Team 17, From Physiopathology of Ocular Diseases to Clinical Development, Université Paris Descartes Sorbonne Paris Cité, Centre de Recherche des Cordeliers, Paris, France. Electronic address: francine.behar@gmail.com.
authors.forename: Francine
authors.initials: F
authors.lastname: Behar-Cohen
mesh_terms: D000368:Aged; D002196:Capillaries / Q000473:pathology; D005451:Fluorescein Angiography; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D008875:Middle Aged; D064847:Multimodal Imaging; D058456:Retinal Telangiectasis / Q000175:diagnosis* / Q000503:physiopathology; D012171:Retinal Vessels / Q000473:pathology*; D041623:Tomography, Optical Coherence; D014792:Visual Acuity / Q000502:physiology