Impact of crossplay between ocular aberrations and depth of focus in topo-guided laser-assisted in situ keratomileusis outcomes

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dc.contributor.authorKhamar, Poojaen_US
dc.contributor.authorShetty, Rohiten_US
dc.contributor.authorAnnavajjhala, Sriramen_US
dc.contributor.authorNarasimhan, Raghaven_US
dc.contributor.authorKumari, Savitrien_US
dc.contributor.authorSathe, Priyankaen_US
dc.contributor.authorRoy, Abhijit Sinhaen_US
dc.date.accessioned2023-08-25T06:36:05Z
dc.date.available2023-08-25T06:36:05Z
dc.date.issued2023-02
dc.description.abstractPurpose: To develop a nomogram in cases with mismatch between subjective and Topolyzer cylinder, and based on the magnitude of the mismatch, customize a treatment plan to attain good visual outcomes post?laser?assisted in situ keratomileusis (LASIK) surgery. Methods: The patients were evaluated preoperatively using corneal tomography with Pentacam. Five optimal corneal topography scans were obtained from the Topolyzer Vario were used for planning the LASIK treatment. For the nomogram purpose, the patients were divided into three categories based on the difference between the subjective cylinder and Topolyzer (corneal) cylinder. The first group (group 1) consisted of eyes of patients, where the difference was less than or equal to 0.4 D. The second group (group 2) consisted of eyes, where the difference was more than 0.4 D and the subjective cylinder was lesser than the Topolyzer cylinder. The third group (group 3) included eyes where the difference was more than 0.4 D but the subjective cylinder was greater than the Topolyzer cylinder. LASIK was performed with the WaveLight FS 200 femtosecond laser and WaveLight EX500 excimer laser. Assessment of astigmatism correction for the three groups was done using Aplins vector analysis. For comparison of proportions, Chi?square test was used. A P value less than 0.05 was considered statistically significant. Results: The UDVA was statistically significantly different when compared between groups 1 and 2 (P = 0.02). However, the corrected distance visual acuity (CDVA) was similar among all the three groups (P = 0.1). Group 3 showed an increase of residual cylinder by ?0.25 D, which was significant at intermediate and near reading distances (P < 0.05). Group 3 showed significantly higher target?induced astigmatism (TIA) compared to groups 1 and 2 (P = 0.01). The mean surgically induced astigmatism (SIA) was the least in group 2, which was statistically significant (P < 0.01). Conclusion: The outcomes for distance vision using our nomogram postoperatively were excellent, but further refinement for improving the near vision outcomes is requireden_US
dc.identifier.affiliationsDepartment of Cornea and Refractive Surgery, Narayana Nethralaya, Bengaluru, Karnataka, Indiaen_US
dc.identifier.affiliationsDepartment of Cataract and Refractive Surgery, Narayana Nethralaya, Bengaluru, Karnataka, Indiaen_US
dc.identifier.affiliationsDepartment of IBMS LAB, Narayana Nethralaya Foundation, Bengaluru, Karnataka, Indiaen_US
dc.identifier.citationKhamar Pooja, Shetty Rohit, Annavajjhala Sriram, Narasimhan Raghav, Kumari Savitri, Sathe Priyanka, Roy Abhijit Sinha. Impact of crossplay between ocular aberrations and depth of focus in topo-guided laser-assisted in situ keratomileusis outcomes. Indian Journal of Ophthalmology. 2023 Feb; 71(2): 467-475en_US
dc.identifier.issn1998-3689
dc.identifier.issn0301-4738
dc.identifier.placeIndiaen_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/224830
dc.languageenen_US
dc.publisherAll India Ophthalmological Societyen_US
dc.relation.issuenumber2en_US
dc.relation.volume71en_US
dc.source.urihttps://doi.org/10.4103/ijo.IJO_191_22en_US
dc.subject3Z nomogramen_US
dc.subjectaberrationen_US
dc.subjectastigmatismen_US
dc.subjectCONTOURAen_US
dc.subjectdepth of focusen_US
dc.subjectLASIKen_US
dc.subjecttopo guideden_US
dc.titleImpact of crossplay between ocular aberrations and depth of focus in topo-guided laser-assisted in situ keratomileusis outcomesen_US
dc.typeJournal Articleen_US
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