The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens
Purpose: To determine the significance of any association between either change in angle kappa (Κ°) or the rectilinear displacement (L, mm) of the first Purkinje image relative to the pupil center and unexpected changes in astigmatism after phacoemulsification. Methods: Orbscan II (Bausch and Lomb)...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2021-01-01
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| Series: | Indian Journal of Ophthalmology |
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| Online Access: | http://www.ijo.in/article.asp?issn=0301-4738;year=2021;volume=69;issue=12;spage=3503;epage=3510;aulast=Tutchenko |
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| author | Larysa Tutchenko Sudi Patel Mykhailo Skovron Olha Horak Oleksiy Voytsekhivskyy |
| author_facet | Larysa Tutchenko Sudi Patel Mykhailo Skovron Olha Horak Oleksiy Voytsekhivskyy |
| author_sort | Larysa Tutchenko |
| collection | DOAJ |
| description | Purpose: To determine the significance of any association between either change in angle kappa (Κ°) or the rectilinear displacement (L, mm) of the first Purkinje image relative to the pupil center and unexpected changes in astigmatism after phacoemulsification. Methods: Orbscan II (Bausch and Lomb) measurements were taken at 1, 2, and 3 months after unremarkable phacoemulsification in patients implanted with spherical (group 1, SA60AT, Alcon) or aspheric (group 2, SN60WF, Alcon) nontoric IOLs. The outputs were used to calculate L. Astigmatism, measured by autorefractometry and subjective refraction, was subjected to vector analysis (polar and cartesian formats) to determine the actual change induced over the periods 1–2 and 2–3 months postop. Results: Chief findings were that the mean (n, ±SD, 95%CI) values for L over each period were as follows: Group 1, 0.407 (38, ±0.340, 0.299–0.521), 0.315 (23, ±0.184, 0.335–0.485); Group 2, 0.442 (45, ±0.423, 0.308–0.577), 0.372 (26, ±0.244, 0.335–0.485). Differences between groups were not significant. There was a significant linear relationship between (A) the change in Κ (ΔΚ = value at 1 month-value at 2 months) and Κ at 1 month (x), where ΔΚ =0.668-3.794X (r = 0.812, n = 38, P = <0.001) in group 1 and ΔΚ = 0.263x -1.462 (r = 0.494, n = 45, P = 0.002) in group 2, (B) L and the J45 vector describing the actual change in astigmatism between 1 and 2 months in group 2, where J45 (by autorefractometry) =0.287L-0.160 (r = 0.487, n = 38, P = 0.001) and J45 (by subjective refraction) =0.281L-0.102 (r = 0.490, n = 38, P = 0.002), and (C) J45 and ΔΚ between 2 and 3 months in group 2, where J45 (by subjective refraction) =0.086ΔΚ-0.063 (r = 0.378, n = 26, P = 0.020). Conclusion: Changes in the location of the first Purkinje image relative to the pupil center after phacoemulsification contributes to changes in refractive astigmatism. However, the relationship between the induced change in astigmatism resulting from a change in L is not straightforward. |
| first_indexed | 2024-04-14T00:00:18Z |
| format | Article |
| id | doaj.art-79291d7d612447e3b15ae61c1cec07ff |
| institution | Directory Open Access Journal |
| issn | 0301-4738 1998-3689 |
| language | English |
| last_indexed | 2024-04-14T00:00:18Z |
| publishDate | 2021-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Indian Journal of Ophthalmology |
| spelling | doaj.art-79291d7d612447e3b15ae61c1cec07ff2022-12-22T02:23:44ZengWolters Kluwer Medknow PublicationsIndian Journal of Ophthalmology0301-47381998-36892021-01-0169123503351010.4103/ijo.IJO_572_21The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lensLarysa TutchenkoSudi PatelMykhailo SkovronOlha HorakOleksiy VoytsekhivskyyPurpose: To determine the significance of any association between either change in angle kappa (Κ°) or the rectilinear displacement (L, mm) of the first Purkinje image relative to the pupil center and unexpected changes in astigmatism after phacoemulsification. Methods: Orbscan II (Bausch and Lomb) measurements were taken at 1, 2, and 3 months after unremarkable phacoemulsification in patients implanted with spherical (group 1, SA60AT, Alcon) or aspheric (group 2, SN60WF, Alcon) nontoric IOLs. The outputs were used to calculate L. Astigmatism, measured by autorefractometry and subjective refraction, was subjected to vector analysis (polar and cartesian formats) to determine the actual change induced over the periods 1–2 and 2–3 months postop. Results: Chief findings were that the mean (n, ±SD, 95%CI) values for L over each period were as follows: Group 1, 0.407 (38, ±0.340, 0.299–0.521), 0.315 (23, ±0.184, 0.335–0.485); Group 2, 0.442 (45, ±0.423, 0.308–0.577), 0.372 (26, ±0.244, 0.335–0.485). Differences between groups were not significant. There was a significant linear relationship between (A) the change in Κ (ΔΚ = value at 1 month-value at 2 months) and Κ at 1 month (x), where ΔΚ =0.668-3.794X (r = 0.812, n = 38, P = <0.001) in group 1 and ΔΚ = 0.263x -1.462 (r = 0.494, n = 45, P = 0.002) in group 2, (B) L and the J45 vector describing the actual change in astigmatism between 1 and 2 months in group 2, where J45 (by autorefractometry) =0.287L-0.160 (r = 0.487, n = 38, P = 0.001) and J45 (by subjective refraction) =0.281L-0.102 (r = 0.490, n = 38, P = 0.002), and (C) J45 and ΔΚ between 2 and 3 months in group 2, where J45 (by subjective refraction) =0.086ΔΚ-0.063 (r = 0.378, n = 26, P = 0.020). Conclusion: Changes in the location of the first Purkinje image relative to the pupil center after phacoemulsification contributes to changes in refractive astigmatism. However, the relationship between the induced change in astigmatism resulting from a change in L is not straightforward.http://www.ijo.in/article.asp?issn=0301-4738;year=2021;volume=69;issue=12;spage=3503;epage=3510;aulast=Tutchenkoangle kappaastigmatismpostphacoemulsificationfirst purkinje image |
| spellingShingle | Larysa Tutchenko Sudi Patel Mykhailo Skovron Olha Horak Oleksiy Voytsekhivskyy The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens Indian Journal of Ophthalmology angle kappa astigmatism postphacoemulsification first purkinje image |
| title | The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens |
| title_full | The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens |
| title_fullStr | The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens |
| title_full_unstemmed | The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens |
| title_short | The relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens |
| title_sort | relationship between angle kappa and astigmatism after phacoemulsification with implanting of spherical and aspheric intraocular lens |
| topic | angle kappa astigmatism postphacoemulsification first purkinje image |
| url | http://www.ijo.in/article.asp?issn=0301-4738;year=2021;volume=69;issue=12;spage=3503;epage=3510;aulast=Tutchenko |
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