Correlation of Corneal and Scleral Pneumatonometry in Pediatric Patients

Lee, Jun Hui; Sanchez, Lucia Rivera; Porco, Travis C.; Han, Ying; Campomanes, Alejandra G. de Alba

doi:10.1016/j.ophtha.2018.02.007

Cited by 8 publications

(3 citation statements)

References 22 publications

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“… 11 Use of pneumatonometry has been described for a number of eye conditions in which the IOP cannot be reliably measured on the central cornea. 11 – 13 Although peripheral IOP as measured by the pneumatonometer has been found to be higher than central IOP measured with the instrument, it has been correlated to central IOP and thus has been suggested as a reasonable alternative to central IOP measurements. 14 Transpalpebral tonometry measures the elastic resistance of the eye to the ballistic tonometer through the upper eyelid and sclera.…”

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confidence: 99%

Comparison of Pneumatonometry and Transpalpebral Tonometry Measurements of Intraocular Pressure during Scleral Lens Wear

et al. 2020

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SIGNIFICANCE As scleral lens wear becomes more common, understanding the impact of these lenses upon ocular physiology is critically important. Studies on the effect of scleral lens wear upon intraocular pressure (IOP) have used different instruments and have reported conflicting results. PURPOSE The purpose of this study was to compare assessment of IOP during scleral lens wear using pneumatonometry and transpalpebral tonometry. METHODS Twenty healthy subjects wore a small-diameter (15.2 mm) and a large-diameter (18.0 mm) scleral lens on the right eye, each for 1 hour in randomized order. IOP was assessed with pneumatonometry and transpalpebral tonometry on both eyes before lens application, immediately after lens application, after 1 hour of lens wear, and immediately after lens removal. Paired t test compared mean IOP in the study eye to the control eye. Repeated-measures ANOVA was performed to take instrumentation, lens diameter, and their interaction into account in an analysis of the change in IOP in the study eye. RESULTS Mean peripheral IOP measured with pneumatonometry was not significantly different from baseline at any subsequent measurement. Measurements with transpalpebral tonometry, however, were significantly different during scleral lens wear immediately after application and after 1 hour of wear with both diameter lenses ( P < .005), but were not significantly different after either sized lens was removed. Repeated-measures ANOVA revealed that the instrument used to measure IOP was a significant factor in IOP changes found during lens wear ( P ≤ .001). CONCLUSIONS Assessment of IOP during scleral lens wear varies based upon the instrument that is used. Although further studies are clearly needed to further elucidate this issue, clinicians should continue to monitor optic nerve structure and function in scleral lens wearers, as they do in all patients.

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confidence: 99%

Comparison of Pneumatonometry and Transpalpebral Tonometry Measurements of Intraocular Pressure during Scleral Lens Wear

et al. 2020

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“…4,5 We commend the authors' frank acknowledgement in the discussion of the limitations of the present study but seek clarification on the points we have raised. REPLY: We would like to thank Grassi et al for their interest in our study 1 and for the opportunity to clarify important aspects of our study and the validity of our findings.…”

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2019

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“…The GAT has also observed a slight increase in IOP after lens removal, around 1 mmHg, because measurements cannot be made during SL wear [4,6]. The pneumotonometer presents a good correlation between corneal and scleral IOP measurements in healthy subjects [12,13], so it has also been used to measure IOP during SL wear [2,14]. Nau et al [14] reported that scleral IOP measurements made while wearing SLs were not accurate and, similar to Fogt et al [2], observed that scleral IOP was approximately 6 mmHg higher than corneal IOP.…”

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confidence: 99%

Assessment by Optical Coherence Tomography of Short-Term Changes in IOP-Related Structures Caused by Wearing Scleral Lenses

Queiruga-Piñeiro

Barros

Lozano-Sanroma

et al. 2023

JCM

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Background: The mechanism that could increase intraocular pressure (IOP) during scleral lens (SL) wear is not fully understood, although it may be related to compression of the landing zone on structures involved in aqueous humor drainage. Methods: Thirty healthy subjects were fitted with two SLs of different sizes (L1 = 15.8 mm, L2 = 16.8 mm) for 2 h in the right eye and left eye as a control. Central corneal thickness (CCT), parameters of iridocorneal angle (ICA), Schlemm’s canal (SC), and optic nerve head were measured before and after wearing both SLs. IOP was measured with a Perkins applanation tonometer before and after lens removal and with a transpalpebral tonometer before, during (0 h, 1 h, and 2 h), and after lens wear. Results: CCT increased after wearing L1 (8.10 ± 4.21 µm; p < 0.01) and L2 (9.17 ± 4.41 µm; p < 0.01). After L1 removal, the ICA parameters decreased significantly (p < 0.05). With L2 removal, nasal and temporal SC area and length were reduced (p < 0.05). An increased IOP with transpalpebral tonometry was observed at 2 h of wearing L1 (2.55 ± 2.04 mmHg; p < 0.01) and L2 (2.53 ± 2.22 mmHg; p < 0.01), as well as an increased IOP with Perkins applanation tonometry after wearing L1 (0.43 ± 1.07 mmHg; p = 0.02). Conclusions: In the short term, SL resulted in a slight increase in IOP in addition to small changes in ICA and SC parameters, although it did not seem to be clinically relevant in healthy subjects.

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Correlation of Corneal and Scleral Pneumatonometry in Pediatric Patients

Cited by 8 publications

References 22 publications

Comparison of Pneumatonometry and Transpalpebral Tonometry Measurements of Intraocular Pressure during Scleral Lens Wear

Comparison of Pneumatonometry and Transpalpebral Tonometry Measurements of Intraocular Pressure during Scleral Lens Wear

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Assessment by Optical Coherence Tomography of Short-Term Changes in IOP-Related Structures Caused by Wearing Scleral Lenses

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