{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,24]],"date-time":"2026-01-24T17:04:41Z","timestamp":1769274281256,"version":"3.49.0"},"reference-count":33,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"8","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":["J Cataract Refract Surg"],"published-print":{"date-parts":[[2022,8]]},"abstract":"<jats:sec>\n            <jats:title>Purpose:<\/jats:title>\n            <jats:p>To report the results of intraocular lens (IOL) power calculation by ray tracing in eyes with previous myopic excimer laser surgery.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Setting:<\/jats:title>\n            <jats:p>G.B. Bietti Foundation I.R.C.C.S., Rome, Italy.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Design:<\/jats:title>\n            <jats:p>Retrospective interventional case series.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods:<\/jats:title>\n            <jats:p>A series of consecutive patients undergoing phacoemulsification and IOL implantation after myopic excimer laser was investigated. IOL power was calculated using ray-tracing software available on the anterior segment optical coherence tomographer MS-39. Axial length (AL) was measured by optical biometry, and 4 values were investigated: (1) that from the printout, (2) the modified Wang\/Koch formula, and (3) the polynomial equation for the Holladay 1 and (4) for the Holladay 2 formulas. The mean prediction error (PE), median absolute error (MedAE), and percentage of eyes with a PE within \u00b10.50 diopters (D) were reported.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results:<\/jats:title>\n            <jats:p>The study enrolled 39 eyes. Entering the original AL into ray tracing led to a mean hyperopic PE (+0.56 \u00b10.54 D), whereas with the Wang\/Koch formula, a mean myopic PE (\u22120.41 \u00b10.53 D) was obtained. The Holladay 1 and 2 polynomial equations lead to the lowest PEs (\u22120.10 \u00b10.49 D and +0.08 \u00b10.49 D, respectively), lowest MedAE (0.37 D and 0.25 D), and highest percentages of eyes with a PE within \u00b10.50 D (71.79% and 76.92%). Calculations based on the Holladay 2 polynomial equation showed a statistically significant difference compared with other methods used (including Barrett-True K formula), with the only exception of the Holladay 1 polynomial equation.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions:<\/jats:title>\n            <jats:p>IOL power was accurately calculated by ray tracing with adjusted AL according to the Holladay 2 polynomial equation.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1097\/j.jcrs.0000000000000902","type":"journal-article","created":{"date-parts":[[2022,2,5]],"date-time":"2022-02-05T01:01:09Z","timestamp":1644022869000},"page":"947-953","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":19,"title":["Intraocular lens power calculation with ray tracing based on AS-OCT and adjusted axial length after myopic excimer laser 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