Quality of vision in refractive and cataract surgery, indirect measurers: review article

Parede, Tais Renata Ribeira; Torricelli, André A. M.; Mukai, Adriana; Netto, Marcelo V.; Bechara, Samir Jacob

doi:10.1590/s0004-27492013000600016

Cited by 26 publications

(18 citation statements)

References 25 publications

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“…T he contrast sensitivity function is considered an im portant aspect of the visual perform ance and the ability to perform daily tasks 3,4 , and seem ed to decrease w ith aging, w hen patients w ere divided into different age groups.…”

Section: Discussionmentioning

confidence: 99%

“…This equipment employs the Functional Acuity Contrast Test -FACT protocol, considered one of the most suitable for clinical studies 4,6 . Its measurements are made by reading sine bars of high quality in the spatial frequencies of 1.…”

Section: Methodsmentioning

confidence: 99%

“…Whereas its measurement consists on the identification of the smallest optotype in maximum contrast condition (perfect sight), contrast sensitivity tests seek to evaluate the daily vision 2 . This is the so-called functional vision, and reflects vision in real situations with the perception of images of different sizes and different levels of contrast 3,4 . The ability to detect low-contrast objects is an important aspect in the visual performance, and is directly related to the ability to perform everyday tasks, such as driving, reading, walking, recognizing faces and using the computer.…”

mentioning

confidence: 99%

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Contrast sensitivity assessment in different age group in medium and high spatial frequency

Sieiro¹,

Coelho²,

Boas³

et al. 2016

Revista Brasileira De Oftalmologia

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RESUMOObjetivo: Comparar a sensibilidade ao contraste nas faixas etárias de 20 a 25, 40 a 45 e acima de 60 anos de idade. Métodos: Realizouse um estudo transversal com indivíduos de diferentes idades, com acuidade visual superior a 20/25, sem doença ocular e sem cirurgia oftalmológica prévia. A acuidade visual foi medida pelo teste de Snellen e, a sensibilidade ao contraste, pelo aparelho OPTEC 3500P®. A análise estatística foi realizada pelo teste de Wilcoxon, considerando um intervalo de confiança de 95%. Resultados: Em relação aos pacientes de 20 a 25 anos, os de 40 a 45 anos não apresentaram diminuição significativa da sensibilidade ao contraste em nenhuma das frequências espaciais avaliadas. Comparando os pacientes acima de 60 anos aos de 40 a 45 anos, houve diminuição da sensibilidade ao contraste nas frequências de 6,0 a 18,0 cpg no modo diurno e de 3,0 a 18,0 cpg no noturno. Já quando comparados aos de 20 a 25 anos, os pacientes maiores de 60 anos mostraram diminuição nas frequências de 3,0 a 18 cpg no modo diurno e em todas as frequências no modo noturno. Conclusão: A função de sensibilidade ao contraste parece diminuir com a idade, após os 45 anos, principalmente nas médias e altas frequências espaciais. Isso pode impactar na leitura, na direção e na mobilidade, dentre outras atividades diárias.Descritores

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Contrast sensitivity assessment in different age group in medium and high spatial frequency

Sieiro¹,

Coelho²,

Boas³

et al. 2016

Revista Brasileira De Oftalmologia

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“…Wavefront aberrations in human eyes are one of the most important factors that degrade retinal image quality so that the various components of the wavefront aberrations, and their interactions, should be carefully analysed. Previous studies have found partial compensation between the cornea and the internal optics .…”

Section: Introductionmentioning

confidence: 99%

Aberration compensation between anterior and posterior corneal surfaces after Small incision lenticule extraction and Femtosecond laser‐assisted laser in‐situ keratomileusis

Wang

Dou

2015

Ophthalmic Physiologic Optic

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Purpose: To investigate the aberration compensation between anterior and posterior corneal surfaces after SMILE and FS-LASIK. Methods: Fifty-five subjects (55 eyes) undergoing SMILE and 51 subjects (51 eyes) undergoing FS-LASIK were enrolled in this study. Wavefront aberrations of anterior and posterior corneal surfaces and the whole cornea at 6 mm in diameter were measured using a Scheimpflug Camera preoperatively and one, three and 6 months postoperatively. The compensation factor (CF), where CF = 1 À (aberration of the whole cornea/aberration of anterior corneal surface), was calculated. Results: Spherical aberration of the posterior surface and the whole cornea remained stable after SMILE. However, spherical aberration of posterior surface increased significantly at 6 months in the FS-LASIK group. The total higher-order aberration (tHOA) of the anterior surface and the whole cornea was lower at 6 months than at one and 3 months (p = 0.001 and 0.001, respectively) in the FS-LASIK group. Meanwhile, in the SMILE group, no significant difference in tHOA was found between various postoperative time points. There were significant decreases in the CF of tHOA compared with preoperative values in both groups. The CF of spherical aberration reduced significantly in both groups at 3 and 6 mm in diameter one, three and 6 months postoperatively. Significant decreases in the CF of vertical coma were found at three and 6 months postoperatively in the FS-LASIK group compared with preoperative values at 6 mm in diameter (p = 0.021 and 0.008, respectively). The change in CF (DCF) of spherical aberration was smaller in the SMILE group than in the FS-LASIK group at one and 3 months postoperatively (p = 0.003 and p < 0.0001, respectively). The DCF of spherical aberration was significantly lower in moderately myopic subjects than in subjects with high myopia at 1 month in the SMILE group (p = 0.041) and at one, three and 6 months in the FS-LASIK group (p = 0.014, 0.020, and 0.004, respectively). Conclusions: The posterior corneal surface plays an important role in compensating for spherical aberration of the anterior corneal surface. The compensation mechanisms of spherical aberration and higher-order aberration between anterior and posterior corneal surfaces were disrupted by the SMILE and the FS-LASIK procedures. The change in the CF of spherical aberration was smaller in the SMILE group compared with the FS-LASIK group, especially in subjects with high myopia.

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“…The requirement for precise measurements and assessments of corneal topography is increasing. Most patients undergoing cataract or refractive surgery expect to experience excellent postoperative uncorrected visual acuity, [1] and for this purpose an accurate and precise examination of such patients’ ocular parameters is mandatory. [2] – [6] In addition, corneal power is indispensable to analyzing the shape of the cornea and for fitting contact lenses.…”

Section: Introductionmentioning

confidence: 99%

Precision and Agreement of Corneal Power Measurements Obtained Using a New Corneal Topographer OphthaTOP

et al. 2015

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PurposeTo evaluate repeatability and reproducibility of anterior corneal power measurements obtained with a new corneal topographer OphthaTOP (Hummel AG, Germany) and agreement with measurements by a rotating Scheimpflug camera (Pentacam HR, Oculus, Germany) and an automated keratometer (IOLMaster, Carl Zeiss Meditec, Germany).MethodsThe right eyes of 79 healthy subjects were prospectively measured three times with all three devices. Another examiner performed three additional scans with the OphthaTOP in the same session. Within one week, the first examiner repeated the measurements using the OphthaTOP. The flat simulated keratometry (Kf), steep K (Ks), mean K (Km), J0, and J45 were noted. Repeatability and reproducibility of measurements were assessed by within-subject standard deviation (Sw), repeatability (2.77 Sw), coefficient of variation (CoV), and intraclass correlation coefficient (ICC). Agreement between devices was assessed using 95% limits of agreement (LoA).ResultsIntraobserver repeatability and interobserver and intersession reproducibility of all measured parameters showed a 2.77 Sw of 0.29 diopter or less, a CoV of less than 0.24%, and an ICC of more than 0.906. Statistically significant differences (P<0.001) were found between the parameters analyzed by the three devices, except J0 and J45. The mean differences between OphthaTOP and the other two devices were small, and the 95% LoA was narrow for all results.ConclusionsThe OphthaTOP showed excellent intraobserver repeatability and interobserver and intersession reproducibility of corneal power measurements. Good agreements with the other two devices in these parameters were found in healthy eyes.

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Quality of vision in refractive and cataract surgery, indirect measurers: review article

Cited by 26 publications

References 25 publications

Contrast sensitivity assessment in different age group in medium and high spatial frequency

Contrast sensitivity assessment in different age group in medium and high spatial frequency

Aberration compensation between anterior and posterior corneal surfaces after Small incision lenticule extraction and Femtosecond laser‐assisted laser in‐situ keratomileusis

Precision and Agreement of Corneal Power Measurements Obtained Using a New Corneal Topographer OphthaTOP

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