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      Measurement of pupil centroid shift and cyclotorsional displacement using iris registration.

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          Abstract

          To estimate the amount and nature of pupil centroid shift and cyclotorsion occurring between preoperative wavefront measurement and refractive surgery.

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          Effect of rotation and translation on the expected benefit of an ideal method to correct the eye's higher-order aberrations.

          A Guirao, D R Williams, I Cox (2001)
          An ideal correcting method, such as a customized contact lens, laser refractive surgery, or adaptive optics, that corrects higher-order aberrations as well as defocus and astigmatism could improve vision. The benefit achieved with this ideal method will be limited by decentration. To estimate the significance of this potential limitation we studied the effect on image quality expected when an ideal correcting method translates or rotates with respect to the eye's pupil. Actual wave aberrations were obtained from ten human eyes for a 7.3-mm pupil with a Shack-Hartmann sensor. We computed the residual aberrations that appear as a result of translation or rotation of an otherwise ideal correction. The model is valid for adaptive optics, contact lenses, and phase plates, but it constitutes only a first approximation to the laser refractive surgery case where tissue removal occurs. Calculations suggest that the typical decentrations will reduce only slightly the optical benefits expected from an ideal correcting method. For typical decentrations the ideal correcting method offers a benefit in modulation 2-4 times higher (1.5-2 times in white light) than with a standard correction of defocus and astigmatism. We obtained analytical expressions that show the impact of translation and rotation on individual Zernike terms. These calculations also reveal which aberrations are most beneficial to correct. We provided practical rules to implement a selective correction depending on the amount of decentration. An experimental study was performed with an aberrated artificial eye corrected with an adaptive optics system, validating the theoretical predictions. The results in a keratoconic subject, also corrected with adaptive optics, showed that important benefits are obtained despite decentrations in highly aberrated eyes.
          Article 0 comments Cited 23 times – based on 0 reviews     Review now
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            Cyclotorsional eye motion occurring between wavefront measurement and refractive surgery.

            Dimitri A Chernyak (2004)
            To quantify the cyclorotation occurring between wavefront measurement and laser refractive surgery.
            Article 0 comments Cited 19 times – based on 0 reviews     Review now
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              Rotational malposition during laser in situ keratomileusis.

              Anil Swami, Roger F Steinert, Winifred E Osborne … (2002)
              To investigate the degree of rotational malposition in eyes undergoing laser in situ keratomileusis.
              Article 0 comments Cited 15 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (iso-abbrev): Ophthalmologica
                Title: Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift fur Augenheilkunde
                Publisher: S. Karger AG
                ISSN (Electronic): 1423-0267
                ISSN (Print): 0030-3755
                Publication date (Electronic): 2009
                Volume: 223
                Issue: 3
                Affiliations
                [1 ] Department of Ophthalmology and Visual Science, Kangnam St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
                Article
                Publisher Item ID: 000194663
                DOI: 10.1159/000194663
                PubMed ID: 19158447
                SO-VID: 11874180-39b2-4b1c-b40e-95c63ff92dc1
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