The curvature measurement of the human eyeball

Yun Long Lay, Rong Seng Chang, Pei Wen Chen, Ming Chang Tu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The curvature of the cornea in the ophthalmology field is essential data, especially for humans when they are being tested for wearing contact lenses, or for patients undergoing refractive surgery by either knife or laser. It is extremely difficult to measure the curvature of the eye precisely because the measurement of the cornea, using a contact tool, is not possible. In this paper, we propose a method to measure the curvature using lens aberration theory and an image processing technique. We project a circular grating, known as a Placido disc, on to the cornea. The reflective image does not have equal divisions and this distortion value contains the curvature information.

Original languageEnglish
Pages (from-to)339-344
Number of pages6
JournalOptics and Laser Technology
Issue number6
StatePublished - Sep 1997


  • Curvature
  • Distortion aberration
  • Image processing
  • Ophthalmology
  • Placido disc


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