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Comparative Study
. 2016 Apr-Jun;23(2):183-6.
doi: 10.4103/0974-9233.179707.

A Comparison of Rebound to Indentation Tonometry in Supine Sedated Children with Glaucoma

Dora H AlHarkan  1 , Fatemah T Al-Shamlan  2 , Deepak P Edward  3 , Arif O Khan  4
Affiliations
Comparative Study

A Comparison of Rebound to Indentation Tonometry in Supine Sedated Children with Glaucoma

Dora H AlHarkan et al. Middle East Afr J Ophthalmol. 2016 Apr-Jun.

Abstract

Purpose: 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.

Keywords: Chloral hydrate; Indentation tonometry; Pediatric glaucoma; Rebound tonometry.

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Figures

Figure 1
Figure 1
(Bland-Altman plot, Icare PRO and Pneumotonometer): The Bland-Altman plot confirms a tendency for Icare PRO values to measure lower than Pneumotonomer values
Figure 2
Figure 2
(Bland-Altman plot, Icare PRO and Tono-Pen XL): The Bland-Altman plot confirms a tendency for Icare PRO values to measure lower than Tono-Pen XL values
Figure 3
Figure 3
(Linear plot, Icare PRO and Pneumotonometer): The positive linear correlation between Icare PRO and Pneumotonometer values is shown. Spearman coefficient was 0.80, P < 0.001
Figure 4
Figure 4
(Linear plot, Icare PRO and Tono-Pen XL): The positive linear correlation between Icare PRO and Tono-Pen XL values is shown. Spearman coefficient was 0.85, P < 0.001
See this image and copyright information in PMC

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