Nidek OPD-scan analysis of normal, keratoconic, and penetrating keratoplasty eyes

Sunil Shah, Shehzad Naroo, Sarah Hosking, Doina Gherghel, Sanjay Mantry, Somnath Bannerjee, Katie Pedwell, Harkaran S. Bains

Research output: Contribution to journalArticle

Abstract

PURPOSE: To determine by wavefront analysis the difference between eyes considered normal, eyes diagnosed with keratoconus, and eyes that have undergone penetrating keratoplasty
METHODS: The Nidek OPD-Scan wavefront aberrometer was used to measure ocular aberrations out to the sixth Zernike order. One hundred and thirty eyes that were free of ocular pathology, 41 eyes diagnosed with keratoconus, and 8 eyes that had undergone penetrating keratoplasty were compared for differences in root mean square value. Three and five millimeter root mean square values of the refractive power aberrometry maps of the three classes of eyes were compared. Radially symmetric and irregular higher order aberration values were compared for differences in magnitude.
RESULTS: Root mean square values were lower in eyes free of ocular pathology compared to eyes with keratoconus and eyes that had undergone penetrating keratoplasty. The aberrations were larger with the 5-mm pupil. Coma and spherical aberration values were lower in normal eyes.
CONCLUSION: Wavefront aberrometry of normal, pathological, and eyes after surgery may help to explain the visual distortions encountered by patients. The ability to measure highly aberrated eyes allows an objective assessment of the optical consequences of ocular pathology and surgery. The Nidek OPD-Scan can be used in areas other than refractive surgery.
Original languageEnglish
Pages (from-to)S255-S259
Number of pages5
JournalJournal of Refractive Surgery
Volume19
Issue number2, March Suppl.
DOIs
Publication statusPublished - Mar 2003
Event8th Annual Nidek International Excimer Laser Symposium - Shanghai, China
Duration: 6 Dec 20027 Dec 2002

Keywords

  • eyes
  • normal
  • keratoconus
  • penetrating keratoplasty
  • Nidek OPD scan
  • ocular aberrations
  • ocular pathology
  • wavefront aberrometer

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