Agreement of intraocular pressure measurement by scleral Schiotz and Goldmann applanation tonometer.

Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE

Original Publication: London : Nature Publishing Group, copyright 2011-

Intraocular Pressure*/physiology ; Tonometry, Ocular*/methods ; Tonometry, Ocular*/instrumentation ; Sclera*; Humans ; Middle Aged ; Male ; Female ; Cross-Sectional Studies ; Adult ; Aged ; Cornea

Aim & background : Intraocular pressure (IOP) measured through the sclera has some advantages over IOP measured through cornea. This study aimed to determine the agreement between IOP as estimated by scleral Schiotz (SS) tonometer and Goldmann applanation tonometer (GAT).
Methods: In this cross-sectional observational study, IOP was measured by GAT on the cornea and Schiotz tonometer on the temporal sclera. Axial length and central corneal thickness (CCT) were noted. IOP was then estimated from SS IOP as eGAT using a predictive formula. Agreement of IOP corrected for CCT (cGAT) with eGAT and SS IOP were assessed. The effects of age, axial length, refraction, CCT, gender, and ocular and systemic comorbidity on measured IOP were also assessed.
Results: The study included 155 patients with a mean age of 54.27 ± 10.02 years. Mean IOP measured by GAT and scleral Schiotz were 16.58 ± 2.76 mm Hg and 16.10 ± 2.96 mm Hg, respectively. The mean IOP by cGAT and eGAT were 16.70 ± 2.80 mm Hg and 17.07 ± 3.10 mm Hg, respectively. Both eGAT & SS IOP had good agreement with cGAT on the Bland-Altmann plot (p = 0.96 & 0.51, respectively). Further, SS IOP showed good agreement even with GAT IOP (p = 0.78). Age, axial length, refraction, central corneal thickness, gender, and ocular and systemic comorbidity did not show significant correlation with IOP measurement.
Conclusion: Estimated GAT IOP showed good agreement with measured GAT values. SS IOP also agreed well with GAT IOP. Clinical significance IOP measurement on the sclera using Schiotz can be used as an alternative to GAT.
Competing Interests: Declarations Competing interests The authors declare no competing interests. Conflict of interest All the authors declare that they have no conflict of interest relevant to the contents of this article. Ethics approval All procedures performed in this study were in accordance with the ethical standards of the institutional and national research committee and with the Helsinki Declaration and its amendments. The study was approved by the institutional ethics committee (Res/01/2019/81/IHEC/027). Consent to participate Written informed consent was obtained in native language from all participants.
(© 2024. The Author(s).)

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Keywords: Corneal IOP; Intraocular pressure estimation; Ocular rigidity; Predictive formula for IOP; Schiotz tonometer; Scleral IOP; Scleral biomechanics

Date Created: 20241113 Date Completed: 20241113 Latest Revision: 20241116

20250114

PMC11561142

10.1038/s41598-024-79403-1

39537834