July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Goldmann applanation tonometry error relative to intracameral pressure and partial correction with a shaped applanating prism surface
Author Affiliations & Notes
  • Sean Joseph McCafferty
    Arizona Eye Consultants, Tucson, Arizona, United States
    Intuor Technologies, Tucson, Arizona, United States
  • jason levine
    Arizona Eye Consultants, Tucson, Arizona, United States
  • Footnotes
    Commercial Relationships   Sean McCafferty, Abbott Medical Optics (F), intuor technologies (P), intuor technologies (I); jason levine, None
  • Footnotes
    Support  NIH Grant R43 EY026821-01
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 2680. doi:
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    • Get Citation

      Sean Joseph McCafferty, jason levine; Goldmann applanation tonometry error relative to intracameral pressure and partial correction with a shaped applanating prism surface. Invest. Ophthalmol. Vis. Sci. 2018;59(9):2680.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Examine errors from a standrard Goldmann applanation tonometer and a shaped correction surface Goldmann prism relative to intracameral intraocular pressure (IOP) in live human eyes.

Methods : Intracameral IOP was measured via pressure transducer on fifty-eight (58) eyes undergoing cataract surgery and the IOP was set manometrically on each patient sequentially to 10, 20, and 40mmHg. The IOP was measured using a Perkins tonometer on the eyes at each set intracameral pressure both with a standard flat surfaced Goldmann prism and a modified shaped surface Goldmann prism. Differences between the two prism measurements were correlated to central corneal thickness (CCT) and corneal resistance factor (CRF).

Results : The Goldmann-type tonometer error measured on live human eyes was 5.2 +/-1.6 mmHg lower than intracameral IOP (p = 0.0009). Insignificant bias was noted between the Goldmann and shaped surface prisms (p=0.31). A multivariate regression analysis with linear mixed-effects revealed a statistically significant decrease in sensitivity to CCT (p = 0.021) and nearly significant decrease in sensitivity to CRF (p = 0.055) using a shaped surface Goldmann prism compared to a standard Goldmann prism.

Conclusions : Goldmann IOP measures significantly lower than true intracameral IOP by approximately 5 mmHg. Both CCT and CRF have a significant sloped correlation to Goldmann IOP measurement error when compared to true intracameral IOP. The results demonstrated a statistically significant decreased shaped Goldmann prism sensitivity to CCT IOP error and nearly significant decreased sensitivity to CRF when compared to the standard Goldmann prism.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.

 

GAT prism and modified surface GAT prism

GAT prism and modified surface GAT prism

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