OCULUS Pentacam - Proper Usage; General Usage Guidelines

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Table of contents
1 Introduction....................................................................................................................................................5
2 Description of the unit and general remarks..........................................................................................5
3 Differences between the various topography maps of Pentacam®.............................................6-11
3.1 Calculation of corneal power..........................................................................................................................6
3.2 Sagittal power map (also called axial power map)...................................................................................7
3.3 Refractive power map.......................................................................................................................................8
3.4 True Net Power....................................................................................................................................................9
3.5 Equivalent Keratometer Readings power map.........................................................................................10
3.6 Total Cornea Refractive Power map............................................................................................................11
4 Recommended settings and color maps, displays and values....................................................12-14
4.1 Recommended settings...................................................................................................................................12
4.2 Recommended color maps, displays and values......................................................................................13
4.2.1 Screening for corneal refractive surgery.......................................................................................13
4.2.2 Pre-op screening for iris fixated phakic IOL implantation.......................................................13
4.2.3 Glaucoma screening............................................................................................................................14
4.2.4 Cataract surgery and IOL calculation for virgin and post refractive corneas....................14
5 Differences between Placido and elevation-derived curvature maps
by Prof. Michael W. Belin....................................................................................................................15-19
5.1 Keratoconus in OD and OS?..................................................................................................................... .....15
5.2 Form fruste keratoconus?.......................................................................................................................... ....18
6 Fast Screening Report as a first step in examining a patient and evaluating
one’s findings by Ina Conrad-Hengerer, MD................................................................................. 20-27
6.1 Case 1: Unilateral high astigmatism with suspicion of bilateral keratoconus...............................20
6.2 Case 2: Fuchs’ dystrophy with DMEK cataract surgery – progress evaluation...............................23
6.3 Case 3: Corneal injury sustained from an eye drop bottle after cataract surgery.........................26
7 Refractive Power Distribution display by Ina Conrad-Hengerer, MD.......................................28-30
7.1 Visual acuity impairment during nighttime driving with distance spectacles –
nocturnal myopia? ........................................................................................................................................... 28
8 Corneal ectasia.....................................................................................................................................31-35
8.1 Case 1: Ectasia after radial keratotomy by Prof. Renato Ambrósio Jr .............................................31
8.2 Case 2: Ectasia after LASIK? by Prof. Michael W. Belin.........................................................................33
9 Glaucoma...............................................................................................................................................36-46
9.1 Case 1: General screening by Tobias H. Neuhann, MD..........................................................................36
9.2 Case 2: YAG laser iridectomy by Eduardo Viteri, MD.............................................................................37
9.3 Screening for narrow angles by Dilraj S. Grewal, MD...........................................................................39
9.3.1 Case 1.....................................................................................................................................................39
9.3.2 Case 2.....................................................................................................................................................42
9.4 Evaluating the anterior segment in phacomorphic glaucoma by Dilraj S. Grewal, MD..................45
Table of contents