Testing the tonometers

Article

Intraocular pressure (IOP) measurements taken with Pascal dynamic contour tonometry (DCT) and the TonoPen appear to be influenced by central corneal thickness (CCT), according to a study published in the May issue of Acta Ophthalmologica Scandinavica.

Intraocular pressure (IOP) measurements taken with Pascal dynamic contour tonometry (DCT) and the TonoPen appear to be influenced by central corneal thickness (CCT), according to a study published in the May issue of Acta Ophthalmologica Scandinavica.

A team of researchers led by Maria Salvetat of Santa Maria della Misericordia Hospital in Udine, Italy, compared IOP measurements taken with the Pascal DCT, TonoPen and Goldman applanation tonometry (GAT).

One eye in 101 consecutive primary open-angle glaucoma patients underwent ultrasonic CCT measurement and IOP evaluation with all three systems, in random order.

After assessing the agreement between results using the Bland-Altman method, the authors concluded that the agreement with GAT measurements was higher for Pascal DCT than for TonoPen readings. Pascal DCT, however, was found to significantly overestimate IOP values compared with GAT and both Pascal DCT and the TonoPen were influenced by CCT, the influence being greater for the latter.

Newsletter

Join ophthalmologists across Europe—sign up for exclusive updates and innovations in surgical techniques and clinical care.

Recent Videos
A photo of Seville, Spain, with the Congress on Controversies in Ophthalmology logo superimposed on it. Image credit: ©francovolpato – stock.adobe.com; logo courtesy COPHy
Anat Loewenstein, MD, Professor and Director, Department of Ophthalmology, Tel Aviv Medical Center, discusses the Congress on Controversies in Ophthalmology (COPHy)
(Image credit: Ophthalmology Times Europe) AGS 2025: Clemens Strohmaier, PhD, on improving aqueous humour outflow following excimer laser trabeculostomy
3 experts are featured in this series.
Anat Loewenstein, MD, speaks about the 22nd Annual Angiogenesis, Exudation, and Degeneration Meeting in February 2025 and shares her global forecast for AI-driven home OCT
3 experts are featured in this series.
3 experts are featured in this series.
Sarah M. Thomasy, DVM, PhD, DACVO, a veterinary ophthalmologist at UC Davis, talks about how her research at the Glaucoma 360 symposium
I. Paul Singh, MD, an anterior segment and glaucoma specialist, discusses the Glaucoma 360 conference, where he participated in a panel discussion on the use of artificial intelligence (AI) in glaucoma care.
Sunita Radhakrishnan, MD, an associate at the Glaucoma Center of San Francisco, speaks at the annual Glaucoma 360 meeting about electrical neurostimulation.
Related Content
© 2025 MJH Life Sciences

All rights reserved.