Agreement Between Corneal Topography with the Dual-Scheimpflug Placido Corneal Topographer, Scheimpflug Corneal Topographer, and Scanning-Slit Topography.

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Agreement Between Corneal Topography with the Dual-Scheimpflug Placido Corneal Topographer, Scheimpflug Corneal Topographer, and Scanning-Slit Topography in Keratoconus: Implications for Assessing Progression Pravin K Vaddavalli MD, Shyamsunder T, Parthasarthy K, Preetam Kumar, Shrikant D, Preeji MS, Reekham S, Faiza S Cornea Service, Contact lens service LV Prasad Eye Institute Hyderabad, India None of the authors has any financial interests or conflict of interest to disclose

Purpose PENTACAM ORBSCAN GALILEI To assess the repeatability of the Orbscan, Pentacam and Galilei topography systems in normal and keratoconus eyes To assess the agreement between these three topography machines in assessing normal and keratoconus eyes

Methods 96 right eyes on normal patients 45 clinically diagnosed keratoconus 2 scans each on Orbscan, Pentacam and Galilei Intersession variability, instrument agreement

INTERSESSION REPEATABILITY (MAX/STEEP KERATOMETRY) NORMALS NORMALS NORMALS INTERSESSION REPEATABILITY (MAX/STEEP KERATOMETRY) ORBSCAN PENTACAM GALILEI KERATOCONUS KERATOCONUS KERATOCONUS

INTER INSTRUMENT REPEATABILITY (MAX/STEEP KERATOMETRY) NORMALS NORMALS NORMALS INTER INSTRUMENT REPEATABILITY (MAX/STEEP KERATOMETRY) ORBSCAN vs PENTACAM PENTACAM vs GALILEI ORBSCAN vs GALILEI KERATOCONUS KERATOCONUS KERATOCONUS

SUMMARY Normals – Pentacam had least intersession variability Keratoconus eyes – all topographers showed greater intersession variation compared to normals, Galilei was best Between instruments, Pentacam and Galilei had the highest agreement in both normals and keratoconus eyes