title: A Comparison of Rebound to Indentation Tonometry in Supine Sedated Children with Glaucoma.
abstract: OBJECTIVE
  To compare intraocular pressure (IOP) measurements by rebound tonometry (Icare PRO; Icare Finland Oy, Helsinki, Finland) to measurements by indentation tonometry (Pneumotonometer Model 30 classic and Tono-Pen XL; Reichert, Buffalo, NY, USA) in supine sedated children with glaucoma.
  
  
  METHODS
  Prospective comparative observational study of Saudi Arabian children with glaucoma undergoing chloral hydrate sedation for ophthalmic examination (February 2012 - February 2013). Nonglaucomatous eyes were included as controls. Eyes with corneal scars or prior corneal transplant or lamellar surgery were excluded.
  
  
  RESULTS
  Fifty-two eyes (26 OD, 26 OS) of 28 children were included. Thirty-six eyes had glaucoma (32 primary congenital glaucoma, two Sturge-Weber related, and two aphakia related). Sixteen eyes did not have glaucoma (six with pediatric cataract, five normal eyes, two strabismic eyes, two eyes with simple megalocornea, and one eye had peripheral corneal laceration repair. In the glaucoma group, the mean IOP was 17.55 ± 5.97 mmHg (range, 8-31.5 mmHg) with the Icare PRO and 20 ± 6.4 mmHg (range, 8-35.5 mmHg) with the Pneumotonometer from 20.47 ± 6.81 mmHg (range, 10-43 mmHg) with the Tono-Pen XL. The Icare PRO readings were significantly lower than each of the indentation tonometers. For the control group, there was no statistically significant difference in IOP measured by the Icare PRO and the indentation tonometers.
  
  
  CONCLUSIONS
  In this population of supine sedated children with glaucoma, IOP measurements with the Icare PRO tend to be lower than readings from the Pneumotonometer and Tono-Pen XL.
authors.affiliation: King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; Department of Ophthalmology, College of Medicine, Qassim University, Qassim, Saudi Arabia.
authors.forename: Dora H
authors.initials: DH
authors.lastname: AlHarkan
authors.affiliation: King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; Dhahran Eye Specialist Hospital, Dhahran, Saudi Arabia.
authors.forename: Fatemah T
authors.initials: FT
authors.lastname: Al-Shamlan
authors.affiliation: King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA.
authors.forename: Deepak P
authors.initials: DP
authors.lastname: Edward
authors.affiliation: King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; Eye Institute, Cleveland Clinic Abu Dhabi, Abu Dhabi, United Arab Emirates.
authors.forename: Arif O
authors.initials: AO
authors.lastname: Khan
mesh_terms: D002675:Child, Preschool; D002697:Chloral Hydrate / Q000008:administration & dosage; D005260:Female; D005901:Glaucoma / Q000175:diagnosis*; D006801:Humans; D006993:Hypnotics and Sedatives / Q000008:administration & dosage; D007223:Infant; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D011446:Prospective Studies; D015203:Reproducibility of Results; D012529:Saudi Arabia; D016683:Supine Position; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000379:methods
chemical_list: D006993:Hypnotics and Sedatives; D002697:Chloral Hydrate
keywords: Chloral hydrate; Indentation tonometry; Pediatric glaucoma; Rebound tonometry