1 / 11

Mark Welch, DO and Steven Waller, MD No financial interest

Pterygia Measurements with Standard Slitlamps and with Anterior Segment Optical Coherence Tomography: Pilot Study. Mark Welch, DO and Steven Waller, MD No financial interest. Background. Previous Studies Demonstrating Anterior OCT Anterior Chamber Dimensions Intraocular Lens Position

malaya
Download Presentation

Mark Welch, DO and Steven Waller, MD No financial interest

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Pterygia Measurements with Standard Slitlamps and with Anterior Segment Optical Coherence Tomography: Pilot Study Mark Welch, DO and Steven Waller, MD No financial interest

  2. Background • Previous Studies Demonstrating Anterior OCT • Anterior Chamber Dimensions • Intraocular Lens Position • Corneal Thickness • Corneal thinning after Mytomycin C • Clinical challenges of pterygium measurements • Subjectivity of Slit Lamp measurements • Cannot measure thickness with Slit Lamp

  3. Compare horizontal measurements of pterygia by slit lamp beam to caliper measurements overlayed on Anterior Segment OCT images Purpose

  4. Methods • 10 Patients and 13 nasal pterygia were evaluated. Patients with significant ocular surface disease were excluded • Horizontal measurements were taken by two physicians with the slit lamp beam and caliper at 16 mag • Measurements were taken from the apex of the lesion to the limbus • Two images of lesions with Anterior Segment OCT • Caliper measurements of lesions

  5. Methods Example of INCORRECT meridian to see lesion – 45 degrees Example of CORRECT Meridian at 180 degrees images the lesion

  6. Visante OCT measurements Caliper Measurements

  7. Results Difference in Slit Lamp Measurements MD = 0.30 SD = 0.32

  8. Results Difference in OCT Measurements MD = 0.1 SD = 0.12

  9. Conclusions • OCT gives statistically more reproducible results than slit lamp for horizontal measurements of pterygia (P=0.0256) • OCT can reproduce measurements in the same axis meridian and appears to be less subjective with regard to the starting and stopping point for making measurements

  10. Study Limitations • Small number of patients • Inherant variability of slit lamp measurements

  11. References Buchwald HJ, Muller A, Spraul CW, Lang GK. Ultrasound Biomicroscopy of Conjunctival Lesions. KlinMonatsblAugenheilkd. 2003 Jan-Feb; 220(1-2):29-34. Buchwald HJ, Muller A, Kampmeier J, Lang GK. Optical Coherence Tomography versus Ultrasound Biomicroscopy of Conjunctival and Eyelid Lesions. KlinMonatsblAugenheilkd. 2003 Dec; 220(12):822-9. Baikoff G, Lutun E, Ferraz C, and Wei J. Static and Dynamic Analysis of the Anterior Segment With Optical Coherence Tomography. J Cataract Refract Surg. 2004 Sep; 30(9):1843-50. Adamis AP, Starck T, Kenyon KR. The Management of Pterygium. OphthalmolClin North Am. 1990; 2(4):611. Kent C. Breaking New Ground in Ultrasound. Review of Ophthalmology. 2006 Nov; 13(11):22-26. Lin, H, Shen S, Huang S, Tsai R. Ultrasound Biomicroscopy in Pigmented Conjunctival Cystic Nevi. Cornea. 2004 Jan; 23(1):97-99. Solomon A, Kaiserman I, Raiskup F, Landau D, Frucht-Pery J. Long-term Effects of Mitomycin C in Pterygium Surgery on Scleral Thickness and the Conjunctival Epithelium. Ophthalmology. 2004 Aug; 111(8):1522-1527. Dada T, Sihota R, Gadia R, Aggarwal A, Mandal S, Gupta V. Comparison of Anterior Segment Optical Coherence Tomography and Ultrasound Biomicroscopy for Assessment of the Anterior Segment. J Cataract Refract Surg. 2007 May; 33:837-840. Emmy YM, Mohamed S, Leung C, Rao S, Cheng A, Cheung C, Lam D. Agreement Among 3 Methods to Measure Corneal Thickness: Ultrasound Pachymetry, Orbscan II, and Visante Anterior Segment Optical Coherence Tomography. Opthalmology. 2007 October; 114(10):1842-1847. Fujimoto JG. Optical Coherence Tomography: Introduction. In: Bouma BE, Tearney GJ, eds, Handbook of Optical Coherence Tomography. New York, NY, Marcel Dekker, 2002; 1-40. Goldsmith J, Li Y, Regina M, Chalita MR, Westphal V, Patil C, Rollins AM, Izatt JA, Huang D. Anterior Chamber Width Measurement by High-Speed Optical Coherence Tomography. Ophthalmology. 2005 Feb; 112(2):238-244. 12. Lin A, Stern G. Correlation between pterygium size and induced corneal astigmatism. Cornea. 17:1998; 28-30. Payman A, Mohammed-Salih, Ahmad F, Sharif . Analysis of Pterygium Size and Induced . Corneal Astigmatism. Cornea. 27: 2008; 434-438.

More Related