ESCRS 2025: Anterior Segment Imaging

The Effect of Tear Film Stability on Variability of Posterior Corneal Curvature Readings Obtained with an SS-Biometer in Cataract Patients

Presenter: Maria Muzyka-Woźniak

A study at Clinical Ophthalmology Center SPEKTRUM, Poland, evaluated variability in IOL Master 700 posterior curvature (PR) readings relative to ocular surface parameters in 100 eyes of 67 cataract patients. Consecutive exams measured anterior and posterior corneal astigmatism and corneal radii standard deviations (SD).

Posterior curvature readings showed significantly higher variability (mean PR_SD ~34–47 µm) than anterior measurements (~2.55–3.96 µm, p<0.001). PR variability did not correlate with tear film or ocular surface parameters but was positively associated with age (ρ=0.26, p=0.007). Conversely, anterior measurement variability correlated negatively with tear break-up times. Thus, posterior curvature readings have greater variability unaffected by tear film but increase with patient age.

European Society of Cataract and Refractive Surgeons (ESCRS) Congress 2025, September 12-16, Denmark