Evaluation of the impact of intracorneal ring segments implantation on the quality of life of patients with keratoconus using the NEI-RQL (National Eye Institute Refractive Error Quality of life) instrument

Paranhos, Juliane de Freitas Santos; Ávila, Marcos Pereira de; Paranhos, Augusto; Schor, Paulo

doi:10.1136/bjo.2009.161562

Cited by 28 publications

(26 citation statements)

References 22 publications

(22 reference statements)

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“…In previous studies on patient life quality, patient experience of life quality decreased if contrast sensitivity decreased at spatial frequencies 3 and 6 cpd (de Freitas Santos Paranhos et al, 2010). Moreover, previous studies (de Freitas Santos Paranhos et al, 2010;Jinabhai et al, 2012) showed that a bigger difference in contrast sensitivity occurred at these frequencies, compared to that in participants without pathologies, and the biggest difference occurred between patients with the apex at the centre and the apex on the periphery.…”

Section: Resultsmentioning

confidence: 85%

“…Contrast sensitivity at frequencies of 3 and 6 cpd are more important for object recognition, and frequencies between 6 and 12 cpd are important for reading (de Freitas Santos Paranhos et al, 2010). Contrast sensitivity at high frequencies is correlated with Snellen visual acuity and contrast sensitivity at low frequencies is not related to the Snellen visual acuity (Brown and Lovie-Kitchin, 1989;Kennedy and Dunlap, 1990).…”

Section: Introductionmentioning

confidence: 95%

“…However, studies have shown that high-contrast visual acuity is not always related to the patient's life satisfaction and highcontrast visual acuity measurement is not the best estimate of visual function, because patients can distinguish and read high-contrast Snellen 20/20 optotype even if the letters have big distortion (de Freitas Santos Paranhos et al, 2011). Patient satisfaction with their quality of life can be affected by the following factors: gender (men were more satisfied with their lives than women), cylinder size (at least 1.00 D cylinder reduction improved the patients' quality of life), and contrast sensitivity at 3 and 6 cpd frequencies (de Freitas Santos Paranhos et al, 2010). Studies have shown that changes in contrast sensitivity are not predictable from visual acuity examination in high-contrast conditions (Carney and Lembach, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Visual Acuity and Contrast Sensitivity Depending from Keratoconus Apex Position

Liduma

Krūņmiņa

2017

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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Various studies have demonstrated that patients with keratoconus have significant loss of contrast sensitivity while its value varies in different studies. None of these studies has analysed reduced contrast sensitivity depending on the position of apex of corneal conus. Visual acuity and contrast sensitivity were evaluated for patients with keratoconus using the FrACT software. Contrast sensitivity was assessed at the following frequencies: 1, 3, 5, 7, 9, 11, 13, and 15

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Visual Acuity and Contrast Sensitivity Depending from Keratoconus Apex Position

Liduma

Krūņmiņa

2017

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

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“…15 A study conducted by the CLEK concluded that QoL is seriously affected in keratoconus patients and continues to decline over time, but an earlier study by our group showed that ICRS implantation improves visual QoL (V-QoL). 16 The correlation between with quality of life (V-QoL) following ICRS implantation in these patients was established. 17 The results demonstrated the low visual acuity present in patients suffering from keratoconus already in the initial grades (0.90 with a variability of ±0.74).…”

Section: Discussionmentioning

confidence: 99%

Intrastromal Corneal Ring Segments Implantation in Patients with Mild Keratoconus

Rodrigues¹,

Dias²

2014

International Journal of Keratoconus and Ectatic Corneal Diseases

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Purpose: The purpose of this study is to evaluate the topographic, topometric and visual changes after implantation of Ferrara intrastromal corneal ring segments (ICRS) in grades I and II keratoconus patients. Materials and methods:The chart records of 50 consecutively operated keratoconus patients were reviewed. The patients were operated on by the same surgeon, with the manual technique. All patients were preoperatively and postoperatively evaluated with the Pentacam (OCULUS Optikgeräte, Wetzlar, Germany). The studied parameters were: uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), keratometry, corneal asphericity and corneal volume.Results: Fifty eyes of 42 patients (26 males and 16 females) were analyzed. The mean preoperative UDVA was 0.91 ranging from LogMAR 0.10 to 1.30. The mean postoperative CDVA was 0.19 ranging from 0.00 to 0.54 LogMAR. The postoperative CDVA was equal or better than 0.18 in 37 cases (74%). The mean K1 decreased from 45.80D (±2.52) preoperatively to 44.27D (± 2.10) postoperatively and the mean K2 value, from 49.06D (± 2.09) to 46.22D (±1.89). The mean asphericity increased from -0.71 preoperatively to -0.29 postoperatively. The average preoperative corneal volume was 56.89 ± 3.11 mm 3 while the average postoperative corneal volume was 57.64 ± 3.05 mm 3 . Conclusion:The study supports the early indication of implantation of Ferrara ICRS in mild to moderate keratoconus cases in order to achieve good visual, keratometric and ashpericity outcomes.

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“…A doença ocorre em todas as raças, é tipicamente bilateral, mas assimétrica, apresenta uma incidência de 1:2.000 na população em geral e tem discreta preponderância no sexo feminino (1) . Diversos estudos apontam que o ceratocone afeta significativamente a qualidade de vida do paciente (6)(7)(8)(9)(10)(11) , além de ser uma das causas mais frequentes de transplante de córnea (12)(13)(14)(15)(16)(17) . A reabilitação visual de pacientes com ceratocone é dada inicialmente com óculos.…”

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