Goldmann Applanation Tonometry Using Sterile Disposable Silicone Tonometer Shields

Maldonado, Miguel J.; Rodrı́guez-Galietero, Antonio; Cano-Parra, J.; Menezo, J.L.; Díaz-Llopis, M.

doi:10.1016/s0161-6420(96)30610-6

Cited by 20 publications

(22 citation statements)

References 15 publications

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“…Chemical disinfection is the common method but incomplete removal of microorganisms, 3 damage to the head, irritation to the ocular tissues, etc have proved disadvantages. 10 The disposable silicone applanation shield has been offered as an option. 10 However, studies have shown the shield to cause average over-readings of 1.9 mmHg.…”

Section: Discussionmentioning

confidence: 99%

“…10 The disposable silicone applanation shield has been offered as an option. 10 However, studies have shown the shield to cause average over-readings of 1.9 mmHg. 10 Moreover, the disposable shields cost over 70 pence per shield.…”

Section: Discussionmentioning

confidence: 99%

“…10 However, studies have shown the shield to cause average over-readings of 1.9 mmHg. 10 Moreover, the disposable shields cost over 70 pence per shield. The disposable prism since it has been introduced has been suggested to be the ideal solution.…”

Section: Discussionmentioning

confidence: 99%

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Comparison between standard Goldmann applanation prism and disposable applanation prism in tonometry

Goel

Chua

Dong

et al. 2004

Eye

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Background Disposable devices are increasingly becoming the preferred choice where possible in contact medical equipment. Aim To evaluate the accuracy of the disposable applanation tonometer head as a potential substitute to the standard Goldmann applanation head. Methods The study was prospective. The intraocular pressure recordings in 80 eyes of 42 patients were compared using the disposable and standard Goldmann applanator heads. The Bland and Altman method of assessing agreement between two methods of clinical measurement was used in the analysis. Results The difference in the readings between the two types of tonometer heads was highly variable (mean difference ¼ 0.78 mm Hg, range ¼ À1 to 11 mm Hg). This was because of the distortions on the applanating surface of the disposable device. When the readings associated with the defective heads were excluded, very strong agreement was obtained (mean ¼ 0.07 mm Hg, range ¼ À1 to 2 mm Hg). Conclusion Good agreement with standard Goldmann applanation is achieved with the disposable heads except where surface distortions induce significant errors. Careful inspection to ensure well-structured disposable units is imperative in disposable applanation tonometry.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Comparison between standard Goldmann applanation prism and disposable applanation prism in tonometry

Goel

Chua

Dong

et al. 2004

Eye

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“…A detailed description of those prisms is available elsewhere. 12,13 The IOP was measured on the slit-lamp microscope after instillation of a drop of proxymetacaine hydrochloride 0.5% and fluorescein sodium 0.25% preservative free solution. In order to avoid errors and bias, the sequence of prisms was determined following a computer-generated random list and the measurements were taken at 5-min intervals.…”

Section: Methods Comparison Study Nomentioning

confidence: 99%

“…11 Silicone tonometer shields (Tonoshield) or disposable tonometer heads (Tonosafe, Tonojet) ( Figure 1) therefore might represent an alternative to repeated chemical disinfection of the prism. 12,13 In the first analysis, we compared Goldmann vs Tonosafe and Tonoshield, as those were the single-use devices most commonly used. The method analysis was repeated when Tonojet become available in the UK.…”

Section: Introductionmentioning

confidence: 99%

A comparison of clinical performance between disposable and Goldmann tonometers

Maino

Uddin

Tullo

2005

Eye

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Purpose Applanation tonometry as performed in routine clinical practice is a significant potential vehicle for cross-infection particularly in an emergency eye care setting. The aim of this study is to evaluate the accuracy and reliability of three single-use devices (Tonoshield, Tonosafe, Tonojet) as an alternative to standard Goldmann prisms in an emergency eye department.Methods All patients attending the eye casualty at the Manchester Royal Eye Hospital for a period of 4 months who required intraocular pressure measurement were eligible for this prospective study. Exclusion criteria were: age below 18 years, corneal anomalies that might affect measurement, and refusal to participate. After taking informed consent, the patient was examined by one experienced nurse practitioner, who measured the intraocular pressure three times. In the first part of the study, we compared the standard Goldmann prism vs Tonoshield and Tonosafe prisms, while for the second part of the study we used standard Goldmann, Tonosafe, and Tonojet prisms. Agreement and repeatability tests were carried out on separate samples. Results Tonosafe and Tonojet correlated well with standard Goldmann tonometry (Po0.001), while the measurements obtained with Tonoshield were higher, especially for raised intraocular pressure measurements. Tonojet and Tonosafe measurements were more reproducible than Tonoshield measurements.Conclusions This study shows that Tonosafe and Tonojet are accurate and reliable alternatives to standard Goldmann tonometry.

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Does the surface property of a disposable applanation tonometer account for its underestimation of intraocular pressure when compared with the Goldmann tonometer?

Osborne

Williams

Batterbury

et al. 2006

Graefe's Arch Clin Exp Ophthalmol

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The magnitude of this force was too small to account for the difference in IOP measurements. The Tonojet was less hydrophilic than the Goldmann, and the contact angle of the fluid was therefore greater. For a given tear film, less hydrophilic tonometers will tend to have thicker mires, and this may lead to underestimation of the IOP. When such disposable tonometers are used, it is recommended care should be taken to reject readings from thick mires.

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Goldmann Applanation Tonometry Using Sterile Disposable Silicone Tonometer Shields

Cited by 20 publications

References 15 publications

Comparison between standard Goldmann applanation prism and disposable applanation prism in tonometry

Comparison between standard Goldmann applanation prism and disposable applanation prism in tonometry

A comparison of clinical performance between disposable and Goldmann tonometers

Does the surface property of a disposable applanation tonometer account for its underestimation of intraocular pressure when compared with the Goldmann tonometer?

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