London · 11–15 September 2026
Treeye at ESCRS 2026
We’re bringing the Optics and Vision Interest Group to the congress. If you scanned a code to get here — hello.
Why we’re there
To meet people, mostly
Treeye is an interest group rather than a company, and the whole point of a congress is the part that happens between sessions. We want to meet clinicians who’d use the tools, researchers with data worth pooling, and industry people who see where the instruments fall short.
What we’re presenting
Seeing behind the iris
Anterior segment OCT is the reference standard for anterior segment biometry: fast, non-contact and highly accurate. But its reach stops at the iris. Light transmission through the iris is limited, and the little that returns is mixed with scattered light, so the structures immediately behind it — the ciliary sulcus among them — remain effectively invisible.
Our work presents an image-processing method that suppresses this non-anatomical signal and makes the structures of the retro-iris space visible in images already acquired in routine practice. We are presenting two posters: the first shows that the enhanced images allow repeatable sulcus-to-sulcus measurement, and the second tests the method against the clinical reference, ultrasound biomicroscopy, and finds good consistency between the two.
From this work we have built an image-processing and marking tool for anterior segment OCT. It isn’t released yet — there is a short demo on the tools page, and we would like to know whether it does what you would need it to.
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Poster 4621 Sulcus-to-sulcus on AS-OCT
Sulcus-to-Sulcus Distance Measurement Using Anterior Segment Optical Coherence Tomography
Abstract
Purpose. To describe a multiscale spatial enhancement method for improving visualization of the retro-iridial space in anterior segment optical coherence tomography (AS-OCT) and to evaluate its clinical performance for sulcus-to-sulcus (STS) measurement.
Setting. Ophthalmology Clinic Vista Sánchez Trancón, Badajoz, Spain.
Methods. AS-OCT images acquired with the Anterion (Heidelberg) were processed using a multiscale spatial enhancement algorithm to reduce retro-iridial noise. Spatial decomposition at multiple scales enabled differentiation of anatomical structures from non-anatomical artefacts. Individual scale maps were combined into a consensus map reinforcing consistent anatomical features while suppressing noise. The enhanced images were used to measure STS distance with a dedicated digital caliper tool. In 30 eyes (30 patients), intra-rater repeatability was assessed by (1) repeated marking of the same image and (2) marking two separate images of the same eye. Agreement among white-to-white (WTW), spur-to-spur (SpTSp) and STS measurements was evaluated.
Results. Mean WTW, SpTSp and STS distances were 12.02 ± 0.35 mm, 12.11 ± 0.33 mm and 12.54 ± 0.54 mm respectively. STS measurements were larger than WTW (mean difference [MD] +0.50 ± 0.30 mm; 95% limits of agreement [LoA] −0.08 to +1.08 mm) and SpTSp (MD +0.41 ± 0.26 mm; 95% LoA −0.10 to +0.92 mm). WTW and SpTSp explained 51% and 61% of STS variability respectively. Intra-rater coefficients of repeatability were 0.07 mm (SpTSp) and 0.18 mm (STS) using the same image, and 0.14 mm (SpTSp) and 0.36 mm (STS) using different images.
Conclusions. Multiscale-enhanced AS-OCT imaging improves visualization of the retro-iridial space and enables repeatable STS measurements. This approach may offer a non-contact alternative for retro-iridial biometry, particularly in the context of phakic IOL sizing.
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Poster 5370 AS-OCT against ultrasound
Sulcus-to-sulcus distance measured with anterior segment OCT and ultrasound biomicroscopy
Abstract
Purpose. To compare sulcus-to-sulcus (STS) distance measurements obtained using anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM).
Setting. Instituto Salmantino de Oftalmología, Salamanca, Spain, and Ophthalmology Clinic Vista Sánchez Trancón, Badajoz, Spain.
Methods. Sixty eyes of 60 patients evaluated for phakic intraocular lens implantation were included. Imaging comprised AS-OCT (CASIA2, Tomey) and UBM (Quantel). UBM scans were obtained along the horizontal meridian by an experienced ophthalmologist, and the mean of three measurements was used as the reference STS value. AS-OCT B-scans were processed with a multiscale enhancement algorithm to improve retro-iridial visualization. STS (AS-OCT) was measured on enhanced images by a masked examiner using a custom caliper, while spur-to-spur (SpTSp) distance was obtained with the device caliper. Agreement was assessed using Bland–Altman analysis and intraclass correlation coefficients. The proportion of STS variability explained by SpTSp was calculated.
Results. Mean SpTSp, STS (AS-OCT) and STS (UBM) were 12.02 ± 0.36 mm, 12.39 ± 0.41 mm and 12.10 ± 0.37 mm respectively. AS-OCT STS measurements were larger than STS (UBM) by +0.23 ± 0.23 mm (95% limits of agreement −0.22 to +0.67 mm). The ICC for consistency was 0.83 (95% CI 0.73–0.90). After adjusting for systematic bias, 31%, 57% and 84% of eyes showed inter-device differences below 0.1, 0.2 and 0.3 mm respectively. SpTSp explained 69% (UBM) and 76% (AS-OCT) of STS variability.
Conclusions. Multiscale-enhanced AS-OCT enables reliable STS measurement with good consistency compared to UBM, but poor absolute agreement. Its non-contact nature and improved centration may offer practical advantages for retro-iridial biometry, particularly relevant for phakic posterior-chamber intraocular lens sizing.
Ivo Soares, Angel Sánchez Trancón, António Baptista and Pedro Serra — Treeye, with the University of Beira Interior, the Physics Centre of Minho and Porto Universities, Instituto Salmantino de Oftalmología and Ophthalmology Clinic Sánchez Trancón (Sanoptis).
Practical
Finding us
- Dates 11–15 September 2026
- Where ExCeL London
- Presenting Posters 4621 and 5370 — session times not published yet
- There in person Pedro Serra, Ivo Soares and António Baptista
- The congress congress.escrs.org (opens in a new tab)
Easiest way to reach us before or during the congress: [email protected]
While you’re here
The calculator is free to use
Our ICL Calculator is online and open source — worth a look if you do Implantable Collamer Lens work.