title: A new slit lamp-based technique for anterior chamber angle estimation.
abstract: OBJECTIVE
  To design and test a new noninvasive method for anterior chamber angle (ACA) estimation based on the slit lamp that is accessible to all eye-care professionals.
  
  
  METHODS
  A new technique (slit lamp anterior chamber estimation [SLACE]) that aims to overcome some of the limitations of the van Herick procedure was designed. The technique, which only requires a slit lamp, was applied to estimate the ACA of 50 participants (100 eyes) using two different slit lamp models, and results were compared with gonioscopy as the clinical standard.
  
  
  RESULTS
  The Spearman nonparametric correlation between ACA values as determined by gonioscopy and SLACE were 0.81 (p < 0.001) and 0.79 (p < 0.001) for each slit lamp. Sensitivity values of 100 and 87.5% and specificity values of 75 and 81.2%, depending on the slit lamp used, were obtained for the SLACE technique as compared with gonioscopy (Spaeth classification).
  
  
  CONCLUSIONS
  The SLACE technique, when compared with gonioscopy, displayed good accuracy in the detection of narrow angles, and it may be useful for eye-care clinicians without access to expensive alternative equipment or those who cannot perform gonioscopy because of legal constraints regarding the use of diagnostic drugs.
authors.affiliation: *PhD †MSc ‡MD University Vision Centre (JG, GC, MAF), Centre for Sensors, Instruments and Systems Development (NT), Universitat Politècnica de Catalunya, Terrassa, Spain; Mútua Terrassa Hospital, Terrassa, Spain (CF); and City University of London, London, United Kingdom (AB).
authors.forename: Joan
authors.initials: J
authors.lastname: Gispets
authors.forename: Genís
authors.initials: G
authors.lastname: Cardona
authors.forename: Núria
authors.initials: N
authors.lastname: Tomàs
authors.forename: Cèlia
authors.initials: C
authors.lastname: Fusté
authors.forename: Alison
authors.initials: A
authors.lastname: Binns
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Fortes
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology*; D003315:Cornea / Q000473:pathology*; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000175:diagnosis*; D006068:Gonioscopy / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014129:Trabecular Meshwork / Q000473:pathology*; D055815:Young Adult