IN THE NAME OF GOD

Dr. Amin Hossein Rahgozar

Pentacam

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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

Pentacam Orbscan

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Anterior elevation

6.5

Posterior elevation

9.8

10.3

30.3

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• • 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

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Patient

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Examination

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Settings

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Display

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

 ISV = Index of surface Variance  IVA= Index of Vertical Asymmetry  KI= Keratoconus –Index  CKI= center Keratoconus – Index  Rmin=Radii minimum  IHA = Index of Height Asymmetric  IHD = Index of Height Decantation  ABR = Aberration coefficient

Indices

Keratocounus indices (only ant. Surface)

Belin/Ambrosio Enhanced Ectasia Display Corneal thickness & progression (CTSP- PTI)

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

شزوپ ضرع نمض ریذپ ناکما اهدیلاسا همادا و یعمس دحاو هب افطل همادا هب زاین تروص رد دشابیمن هرامش اب ای و هعجارم ضیف ینامرد یشزومآ زکرم یرصب دیئامن لصاح سامت LECTUER 392 یلخاد یلااب مجح 03114476010 لیلدب نفلت رکشت اب