May 2004
Volume 45, Issue 13
ARVO Annual Meeting Abstract  |   May 2004
Analysis of the corneal thickness with Orbscan II and ultrasonic pachymeter
Author Affiliations & Notes
  • R. Kopito
    Quinze Vingts Hospital, Paris, France
  • O. Touzeau
    Quinze Vingts Hospital, Paris, France
  • C. Allouch
    Quinze Vingts Hospital, Paris, France
  • V.M. Borderie
    Quinze Vingts Hospital, Paris, France
  • L. Laroche
    Quinze Vingts Hospital, Paris, France
  • Footnotes
    Commercial Relationships  R. Kopito, None; O. Touzeau, None; C. Allouch, None; V.M. Borderie, None; L. Laroche, None.
  • Footnotes
    Support  none
Investigative Ophthalmology & Visual Science May 2004, Vol.45, 136. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      R. Kopito, O. Touzeau, C. Allouch, V.M. Borderie, L. Laroche; Analysis of the corneal thickness with Orbscan II and ultrasonic pachymeter . Invest. Ophthalmol. Vis. Sci. 2004;45(13):136.

      Download citation file:

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

  • Supplements

Abstract: : Purpose: To analyze the corneal thickness obtained by Orbscan and ultrasonic pachymeter. Methods: We prospectively studied the corneal thickness in 300 normal eyes of 150 patients with the Orbscan II (Bausch & Lomb) and Tomey SP–2000 ultrasonic pachymeter, including eyes with ametropia. We used default setting for both devices. Three central ultrasonic readings were averaged to give a single value. For each eye and for both devices two measurements were successively recorded to calculate the reproducibility. With the Orbscan we analyzed the central and peripheral (9 locations) pachymetry, as well as the thinnest point. The localization of the thinnest point according to the corneal apex was analyzed using cartesian coordinates. Results: Central pachymetric measurements of both eyes strongly correlated (rs= 0.98, p<0.001 ultrasonic pachymetry; rs= 0.97, p<0.001, Orbscan pachymetry). For the central pachymetric measurements both methods strongly correlated (rs= 0.97, p<0.001) and the precision of both methods was not significantly different (p=0.14). The difference between 2 successive measurements was approximatively 5 µm or 1%. The distance from the corneal thinnest point to the apex was 0.63 + 0.25 mm. The thinnest point was most commonly located in the inferotemporal quadrant (66%), followed by the superotemporal (24%), inferonasal (6%), and superonasal (4%) quadrants. The central pachymetry is not correlated with the subjective spherical equivalent but with the age (rs= 0.28; p<0.001). Conclusions: The corneal thickness analyzed with the ultrasonic pachymeter and Orbscan provided high reproducibility. There was a significant correlation between the results obtained by both techniques. Contrary to the ultrasonic pachymeters the Orbscan simultaneously measures several thousand points including the thinnest point and provides a colour–coded thickness map without physical contact.

Keywords: topography • refractive surgery: corneal topography • cornea: clinical science 

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.