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Background: To evaluate and compare the astigmatism prediction errors taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens (IOL) implantation.

Methods: Phacoemulsification with toric Precizon IOL implantation was performed in 41 eyes with corneal astigmatism (range, 1 to 5 diopters (D)) determined by IOLMaster and SimK on Pentacam. Preoperative corneal astigmatism measurements were obtained from IOLMaster readings (IOLMaster, Baylor-IOLMaster, and Barrett-IOLMaster) and Pentacam readings (SimK, Baylor-SimK, Barrett-SimK, wavefront, true net power, total corneal refractive power, and vector derived by manual vector summation using corneal front and back astigmatism). Prediction error and intraclass correlation coefficient (ICC) between the measured (or calculated) astigmatism by IOLMaster and Pentacam and the estimated corneal astigmatism estimated by IOL toricity power and residual astigmatism were determined.

Results: The centroid errors in prediction error with IOLMaster, SimK, Baylor-IOLMaster, Baylor-SimK, Barrett-IOLMaster, Barrett-SimK, wavefront, true net power, total corneal refractive power, and vector were 0.59@103, 0.61 @103, 0.37@161, 0.41@162, 0.24@171, 0.36@162, 0.42@106, 0.04@8, 0.07@82, and 0.03@82, respectively, in with-the-rule (WTR) astigmatism eyes at postoperative 3-month. They were 0.22@87, 0.20@74, 0.16@21, 0.54@10, 0.43@3, 0.33@19, 0.51@25, 0.31@58, 0.29@50, and 0.14@50 in against-the-rule (ATR) astigmatism eyes. Of the ten modalities, vector showed the lowest WTR astigmatism prediction error and the highest ICC between the predicted and the estimated corneal astigmatism for both WTR and ATR eyes.

Conclusion: Vector summation using anterior and posterior corneal surface power taken with the Pentacam yields the least astigmatism prediction error and is a promising tool for determining toric IOL cylinder power.

Titel:	Comparison of astigmatism prediction error taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens implantation.
Autor/in / Beteiligte Person:	Park, DY ; Lim, DH ; Hwang, S ; Hyun, J ; Chung, TY
Link:	View record at Springer (Volltext)
Zeitschrift:	BMC ophthalmology, Jg. 17 (2017-08-24), Heft 1, S. 156
Veröffentlichung:	London : BioMed Central, [2001-, 2017
Medientyp:	academicJournal
ISSN:	1471-2415 (electronic)
DOI:	10.1186/s12886-017-0550-z
Schlagwort:	Adult Aged Aged, 80 and over Biometry methods Corneal Topography Female Humans Male Middle Aged Predictive Value of Tests Refraction, Ocular physiology Retrospective Studies Astigmatism physiopathology Cornea physiopathology Lens Implantation, Intraocular methods Lenses, Intraocular Optics and Photonics Phacoemulsification
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [BMC Ophthalmol] 2017 Aug 24; Vol. 17 (1), pp. 156. <i>Date of Electronic Publication: </i>2017 Aug 24. MeSH Terms: Lenses, Intraocular* ; Optics and Photonics* ; Phacoemulsification* ; Astigmatism / physiopathology ; Cornea / physiopathology ; Lens Implantation, Intraocular / *methods ; Adult ; Aged ; Aged, 80 and over ; Biometry / methods ; Corneal Topography ; Female ; Humans ; Male ; Middle Aged ; Predictive Value of Tests ; Refraction, Ocular / physiology ; Retrospective Studies References: J Cataract Refract Surg. 2016 Jan;42(1):84-94. (PMID: 26948782) ; J Cataract Refract Surg. 2002 Sep;28(9):1636-43. (PMID: 12231325) ; J Cataract Refract Surg. 2001 Jan;27(1):61-79. (PMID: 11165858) ; Am J Ophthalmol. 2013 Jul;156(1):53-60. (PMID: 23540708) ; J Cataract Refract Surg. 2013 Dec;39(12):1803-9. (PMID: 24169231) ; Invest Ophthalmol Vis Sci. 2015 Jan 13;56(2):827-35. (PMID: 25587061) ; J Cataract Refract Surg. 1993 Jul;19(4):524-33. (PMID: 8355160) ; J Cataract Refract Surg. 2004 Feb;30(2):414-7. (PMID: 15030833) ; J Refract Surg. 2013 Jul;29(7):476-83. (PMID: 23820230) ; Fam Med. 2005 May;37(5):360-3. (PMID: 15883903) ; Curr Eye Res. 2012 Dec;37(12):1091-8. (PMID: 22916682) ; Invest Ophthalmol Vis Sci. 2014 Dec 02;56(1):291-8. (PMID: 25468887) ; J Cataract Refract Surg. 2015 May;41(5):936-44. (PMID: 25936681) ; J Refract Surg. 2015 Feb;31(2):82-8. (PMID: 25735040) ; Surv Ophthalmol. 1977 Nov-Dec;22(3):177-88. (PMID: 594888) ; J Cataract Refract Surg. 1995 May;21(3):313-9. (PMID: 7674170) ; Restor Dent Endod. 2013 Aug;38(3):182-5. (PMID: 24010087) ; J Cataract Refract Surg. 2014 Jan;40(1):13-9. (PMID: 24355718) ; J Cataract Refract Surg. 2015 Aug;41(8):1650-7. (PMID: 26432122) ; Can J Ophthalmol. 2015 Feb;50(1):26-32. (PMID: 25677279) ; Optom Vis Sci. 1991 Sep;68(9):708-10. (PMID: 1745496) ; Klin Monbl Augenheilkd. 2015 Nov;232(11):1297-303. (PMID: 26575536) ; J Refract Surg. 2015 Oct;31(10):699-707. (PMID: 26469077) ; J Cataract Refract Surg. 2013 Aug;39(8):1204-10. (PMID: 23756347) ; J Cataract Refract Surg. 2016 Feb;42(2):217-25. (PMID: 27026445) Contributed Indexing: Keywords: Astigmatism; Astigmatism prediction error; Barrett formula; Baylor nomogram; Corneal posterior astigmatism; IOLMaster; Pentacam; Toric intraocular lens; Vector Entry Date(s): Date Created: 20170825 Date Completed: 20171206 Latest Revision: 20181113 Update Code: 20231215 PubMed Central ID: PMC5571625

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Comparison of astigmatism prediction error taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens implantation.