Power vector analysis of the optical outcome of refractive surgery

Thibos, Larry N.; Horner, Douglas G.

doi:10.1016/s0886-3350(00)00797-5

Cited by 415 publications

(286 citation statements)

References 16 publications

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“…16 In this system J 0 ¼ ðÀcylinder=2ÞÂ cosð2ÂaxisÞ and J 45 ¼ ðÀcylinder=2ÞÂ sinð2ÂaxisÞ J 0 describes the difference in diopteric power between horizontal and vertical axes and is positive when astigmatism is with-the-rule (vertical K steeper) and negative when it is against-the-rule (horizontal K steeper). J 45 characterises oblique astigmatism being positive if the axis of negative cylinder axis is closer to 451 than 1351 and positive if closer to 1351 than 451.…”

Section: Methodsmentioning

confidence: 99%

The Cataract National Dataset electronic multicentre audit of 55 567 operations: when should IOLMaster biometric measurements be rechecked?

Cartwright

Johnston

Jaycock

et al. 2009

Eye

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Purpose Calculation of intraocular lens (IOL) power for implantation during cataract surgery depends on ocular biometric measurements. The aim of this study was to characterise the normal range of intra-and interindividual variation in axial length (AL) and corneal power (K) when IOLMaster measurements were possible and to derive recommendations as to which outlying measurements merit verification before acceptance. Methods The Medisoft electronic patient database contains prospectively collected data conforming to the United Kingdom (UK) Cataract National Dataset on 55 567 cataract operations. From this AL and K information on the 32 556 eyes (14 016 paired) of patients older than 25 years, without corneal pathology, history of intraocular surgery and who had all biometric measurements taken with the Zeiss IOLMaster (Carl Zeiss Meditec) were extracted. R 2.8.1 (R Foundation for Statistical Computing) was used for statistical analysis.

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Section: Methodsmentioning

confidence: 99%

The Cataract National Dataset electronic multicentre audit of 55 567 operations: when should IOLMaster biometric measurements be rechecked?

Cartwright

Johnston

Jaycock

et al. 2009

Eye

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“…(1,2,3,4) Tais artigos forneceram informações sobre os motivos da análise vetorial (1,2,7,8,9,11,13,14) ou ressaltaram a sua importância clínica. (3,4,6,10,12) DISCUSSÃO O método proposto por Thibos e colaboradores aborda o astigmatismo ceratométrico, incluindo qualquer eventual componente esférico presente, na forma vetorial retangular, como a seguir: (3,13,14) • Média da leitura ceratométrica (M);…”

Section: Resultsunclassified

“…É conveniente interpretar M, J0 e J45 geometricamente como sendo as coordenadas (x, y, z) de um ponto em um espaço dióptrico tridimensional: B é o vetor desenhado a partir da origem da coordenada desse espaço até o ponto (M, J0, J45); APV é o ponto (J0, J45) no plano astigmático. (13,14) A Figura 2 mostra a representação gráfica desses vetores.…”

Section: Resultsunclassified

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Vector analysis of astigmatism according to the methods of Alpins and Thibos: a systematic review

2016

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RESUMOObjetivo: Apesar de a análise vetorial ser amplamente utilizada na literatura, tanto para a descrição de características, como na análise de mudanças no astigmatismo, poucos são os artigos que apresentam a racionalidade do método. Em nossa revisão, apresentamos os pontos mais importantes dos métodos propostos por Alpins e por Thibos. Métodos: O Pubmed foi pesquisado, em 29 de junho de 2016, para artigos em inglês, com resumo, empregando-se os termos (astigmatism) AND (vector analysis) AND (Alpins) OR (Thibos), independentemente da data ou tipo de publicação. Resultados: Treze artigos, de 228 referências, foram incluídos em nossa revisão. Conclusões: O método proposto por Thibos é o mais apropriado para descrições objetivas do astigmatismo. O método de Alpins, por outro lado, é o mais indicado para análises referentes a mudanças no astigmatismo. ABSTRACTAim: Although much has been published on vector-based analysis of astigmatism, the reason why vectors precisely describe astigmatism features, or even changes in its characteristics, has been discussed only on a few articles. Our review intends to highlight the essential features of both methods proposed by Alpins and Thibos. Methods: Pubmed was searched for papers in English, containing abstracts, on June 29th 2016 for (astigmatism) AND (vector analysis) AND (Alpins) OR (Thibos), regardless of the date of publication or the study design. Results: Thirteen papers, out of 228 references, were included in our review. Conclusions: The method proposed by Thibos is suitable whenever an objective description of astigmatism is aimed. However, the method proposed by Alpins may provide detailed information on the assessment of changes in astigmatism. RESUMENObjetivo: A pesar del análisis vectorial ser ampliamente utilizado en la literatura, tanto para la descripción de características como en el análisis de cambios en el astigmatismo, son escasos los artículos que presentan la racionalidad del método. En nuestra revisión, presentamos los puntos más importantes de los métodos propuestos por Alpins y por Thibos. Métodos: Se ha revisado Pubmed el 29 de junio de 2016 para artículos en inglés, con resumen, empleándose los términos (astigmatism) AND (vector analysis) AND (Alpins) OR (Thibos), independientemente de la fecha o tipo de publicación. Resultados: Se incluyeron trece artículos de 228 referencias en nuestra revisión. Conclusiones: El método propuesto por Thibos es el más apropiado para descripciones objetivas del astigmatismo. El método de Alpins, por otro lado, es el más indicado para análisis concernientes a cambios en el astigmatismo.Como citar: Freitas GO, Ambrósio Jr R, Alves MR. Vector analysis of astigmatism according to the methods of alpins and thibos: a systematic review. e-Oftalmo.CBO: Rev Dig Oftalmol. 2016;2(3):1-6. http://dx

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“…Thibos and coworkers (20)(21) take another approach to analyzing astigmatic data. This method separates refractive data into 3 power vectors: spherical equivalent and 2 Jackson crossed cylinders separated by 45 degrees.…”

Section: Astigmatism Analysismentioning

confidence: 99%

Astigmatism treatment during phacoemulsification: a review of current surgical strategies and their rationale

Freitas¹,

Boteon²,

Carvalho³

et al. 2013

Rev. bras.oftalmol.

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Power vector analysis of the optical outcome of refractive surgery

Cited by 415 publications

References 16 publications

The Cataract National Dataset electronic multicentre audit of 55 567 operations: when should IOLMaster biometric measurements be rechecked?

The Cataract National Dataset electronic multicentre audit of 55 567 operations: when should IOLMaster biometric measurements be rechecked?

Vector analysis of astigmatism according to the methods of Alpins and Thibos: a systematic review

Astigmatism treatment during phacoemulsification: a review of current surgical strategies and their rationale

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