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Corneal biomechanics and biomechanically corrected intraocular pressure in primary open-angle glaucoma, ocular hypertension and controls
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  • Published on: 12 December 2019
    Confounding effect of anterior chamber depth on assessment of dynamic air-puff applanation results in glaucoma patients
    • Sushma Tejwani, Glaucoma Specialist Narayana Nethralaya eye hospital, Bangalore, India
    • Other Contributors:
      • Abhijit Sinha Roy, Researcher

    We read the study by Vinciguerra et al. on cornea biomechanical properties of open angle glaucoma, ocular hypertension, normal tension and normal eyes assessed with dynamic air-puff applanation [1]. The study reported significant correlations between the properties and types of glaucoma. Most of the study patients were also under anti-glaucoma medication. Interestingly, the study did not assess the potential confounding effects of the anterior chamber on assessment of corneal biomechanical properties [1]. However, we wish to bring to the notice of the authors our earlier study on the same subject [2]. In our study, open and closed angle patients under the anti-glaucoma medication were assessed with air-puff applanation to determine if medication altered corneal biomechanical properties. The highlight of the study was that anterior chamber depth (ACD) was also included as a covariate in addition to other tomographic features [2]. Our study clearly showed that the ACD had a significant effect of the level of bIOP among the different types of glaucoma patient [2]. The ACD is a direct indicator of the volume of vault space between the cornea and the lens. This vault space resisted the inward motion of the cornea during the first half of the applanation. If ACD was lower, then bIOP was greater and vice versa. In patients with angle closure glaucoma, we expect the ACD to be less than NTG and normal eyes [1,2]. Hence, the results from the Vinciguerra et al. study could be skewed...

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    Conflict of Interest:
    None declared.