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

ContinueAnterior 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

Patient Examination Settings 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

Indices 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

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

پوزش عرض ضمن

باالی حجم اسالیدها LECTUERبدلیل ادامهلطفا ادامه به نیاز صورت در نمیباشد پذیر امکاندرمانی آموزشی مرکز بصری و سمعی واحد به

تلفن شماره با یا و مراجعه فیضتماس حاصل 392 داخلی 03114476010

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