IN THE NAME OF GOD Dr Amin Hossein

IN THE NAME OF GOD Dr. Amin Hossein Rahgozar

Pentacam

Advantages: • Scheimpflug rotating camera with central camera for fixation • Elevation based system • Slight blue light • Eliminate the effect of eye moving • Exact pachymetry • Near virtual pictures of AC in 2 seconds • Measure of AC angle, AC volume, AC depth, pupil diameter and eccentricity • More exact post corneal elevation measuring

Continue Anterior elevation Posterior elevation Pentacam 6. 5 9. 8 Orbscan 10. 3 30. 3

continue • 50 images during one scan with 500 true elevation points per image (total 25000 points) • Repeatable with high sensitivity (compare 2 exams)

The Pentacam Program üPatient üExamination üSettings üDisplay

4 map selectable • • 1. Ant. Elevation 2. Post. Elevation 3. Sagittal curvature (front) 4. Pachymetry

Elevation interpretation • If you are using the manual 8 mm zone for fitting the BFS, the proposed screening – Anterior Elevation differences > +8 μm are typically indicative of keratoconus or other ectatic disorders (in the central zone) – Posterior Elevation differences >16 μm are suspicious

1 large color map

Ellipsoid

Keratoconus map • • • 1. Indices 2. Thickness progression 3. Sagittal curvature 4. Corneal thickness 5. Back elevation

üISV = Index of surface Indices Variance üIVA= Index of Vertical Asymmetry üKI= Keratoconus –Index üCKI= center Keratoconus – Index üRmin=Radii minimum üIHA = Index of Height Asymmetric üIHD = Index of Height Decantation üABR = Aberration coefficient

Keratocounus indices (only ant. Surface)

Belin/Ambrosio Enhanced Ectasia Display • • • 1. Standard v/s enhanced BFS 2. Pachymetric map 3. Corneal thickness & progression (CTSP- PTI)

Standard v/s enhanced BFS Standard Best Fitted Sphere (BFS) Enhanced BFS

Holladay Pentacam Report • A. Measuring of Equivalent K-Reading (EKR) • B. Detecting Form Fruste KC 1. Relative pachymetry > -5% 2. Back elevation > 15 micron 3. Nipple in Tangential map > 48 D