June 2013
Volume 54, Issue 15
Free
ARVO Annual Meeting Abstract  |   June 2013
Scan quality can affect Scanning Laser Polarimetry outcomes
Author Affiliations & Notes
  • Alice Chandra Verticchio Vercellin
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Giovanni Milano
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Sara Lombardo
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Marta Raimondi
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Sara Lanteri
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Carlo Alberto Cutolo
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Laura Bossolesi
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Gemma Rossi
    University of Pavia, Pavia, Italy
    Policlinico San Matteo Pavia, Pavia, Italy
  • Footnotes
    Commercial Relationships Alice Chandra Verticchio Vercellin, None; Giovanni Milano, Alcon (R); Sara Lombardo, None; Marta Raimondi, None; Sara Lanteri, None; Carlo Alberto Cutolo, None; Laura Bossolesi, None; Gemma Rossi, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2013, Vol.54, 4809. doi:
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    • Get Citation

      Alice Chandra Verticchio Vercellin, Giovanni Milano, Sara Lombardo, Marta Raimondi, Sara Lanteri, Carlo Alberto Cutolo, Laura Bossolesi, Gemma Rossi; Scan quality can affect Scanning Laser Polarimetry outcomes. Invest. Ophthalmol. Vis. Sci. 2013;54(15):4809.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose
 

To compare scanning laser polarimetry (GDx) with variable corneal compensation (VCC) versus enhanced corneal compensation (ECC) and to correlate GDx structural data with functional data of Standard Automated Perimetry (SAP).

 
Methods
 

339 eyes of 182 glaucoma suspects were included and screened by the glaucoma unit of the University Eye Clinic of Pavia (Italy). Patients were submitted to complete ophthalmic examination, standard automated perimetry (SAP), scanning laser polarimetry with GDx-VCC and GDx-ECC. Quality image (Q), typical scan score (TSS), nerve fibers index (NFI), nerve fibers layer average thickness in a band around the optic nerve head (TSNIT average) and in the upper (TSNIT sup) and lower sector (TSNIT inf) provided by VCC and ECC were taken into account and compared using Wilcoxon signed-rank test. Correlation between GDx and perimetric global indexes MD, PSD was evaluated with Pearson correlation index. The same statistics tests were applied to a smaller group of 118 eyes characterized by a scanning laser polarimetry of optimal quality (Q>7 and TSS>80 both with VCC and ECC).

 
Results
 

ECC provides better quality images than VCC: 204 images out of 339 (60%) were of good quality (Q>7) with VCC and 325 out of 339 (96%) with ECC. 140 images out of 339 (41%) were atypical (TSS<80) with VCC but only 20 out of 339 with ECC (6%). In both groups ECC versus VCC constantly displays lower TSNIT thickness and higher NFI and structure/function correlation was only poor to moderate, better for ECC parameters and above all for NFI. In the selected group of 118 patients the difference ECC/VCC reduces and there is an increase of the structure/function correlation for VCC parameters particularly for TSNIT inferior and average.

 
Conclusions
 

ECC provides better quality images than VCC and probably reproduces a more reliable RNFL structure model than VCC. ECC points out lower RNFL thickness and higher NFI and reveals a better correlation to perimetric indexes as compared to VCC. GDx-ECC could improve early glaucoma diagnosis. Considering a poor to moderate structure/function correlation even with GDx-ECC, a correct diagnosis of glaucomatous optic neuropathy still requires an evaluation of structure and function of the optic nerve.

     
Keywords: 550 imaging/image analysis: clinical  
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