Quantitative Anatomical Differences in Central Corneal Thickness Values Determined With Scanning-Slit Corneal Topography and Noncontact Specular Microscopy

Sanchis‐Gimeno, Juan A.; Herrera, Manuel; Lleó-Pérez, A.; Alonso, Luis Martı́nez; Rahhal, M.S.; Martı́nez-Soriano, Francisco

doi:10.1097/01.ico.0000176605.72129.2c

Cited by 19 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous studies did not address the reason for the differences between the 2 instruments; rather, they concentrated on the finding that noncontact specular microscopy CCT measurements were statistically lower than those of the Orbscan device. [15][16][17] Our results confirmed this but indicated a fundamental difference between how the slit-scanning device generates peripheral corneal thickness measurements in contrast to the simpler optical principles of specular reflection microscopy or even ultrasound pachymetry. [11][12][13][14] There are 2 main issues.…”

Section: Discussionsupporting

confidence: 91%

“…3 In terms of specific comparisons, the mean difference of 0.061 mm between the slitscanning device and the noncontact specular microscope (Topcon SP-2000P) agrees with findings in previous studies, which report differences between 0.055 mm and 0.066 mm (slit scanning À specular microscopy) for normal corneas. [15][16][17] Noncontact specular microscopy may be a preferred pachymetry method for measurements before and after refractive surgery 19,23 because it can provide endothelial cell counts.…”

Section: Discussionmentioning

confidence: 99%

“…Few studies have compared the CCT measurements between the Orbscan device and noncontact specular microscopy. Three were of normal eyes, [15][16][17] another of patients with keratoconus, 18 and another after laser in situ keratomileusis (LASIK). 19 These reports provide conflicting data, and no study addresses the issue of the more marked differences in midperipheral corneal thickness measurements.…”

Section: J Cataract Refract Surg 2009; 35:2127-2135 Q 2009 Ascrs and mentioning

confidence: 99%

See 2 more Smart Citations

Discrepancy between central and midperipheral corneal thickness measurements obtained with slit-scanning pachymetry and noncontact specular microscopy

Jonuscheit¹,

Doughty²

2009

Journal of Cataract and Refractive Surgery

View full text Add to dashboard Cite

Results show that the slit-scanning pachymeter can substantially overestimate more peripheral thickness measurements of the cornea than specular microscopy or ultrasound pachymetry and that the differences cannot be corrected using the same acoustic factor (0.92). Off-center slit-scanning thickness measurements, therefore, cannot be used interchangeably with those obtained with other pachymetry methods, especially before refractive surgery.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: J Cataract Refract Surg 2009; 35:2127-2135 Q 2009 Ascrs and mentioning

confidence: 99%

See 1 more Smart Citation

Discrepancy between central and midperipheral corneal thickness measurements obtained with slit-scanning pachymetry and noncontact specular microscopy

Jonuscheit¹,

Doughty²

2009

Journal of Cataract and Refractive Surgery

View full text Add to dashboard Cite

show abstract

“…O microscópio especular de não contato é capaz de avaliar o padrão endotelial e realizar a paquimetria corneana ao mesmo tempo. Fotografando o endotélio, este equipamento gera imagem especular e medidas de distância focal, possibilitando o cálculo da espessura corneana (SANCHIS-GIMENO et al, 2006). Na literatura veterinária consultada, não foram observados estudos de paquimetria por microscopia especular em ovinos, ou a comparação desta com a ultra-sônica.…”

Section: Introductionunclassified

Mensuração Da Espessura Corneana Em Ovinos Com Paquimetria Ultra-Sônica E Microscopia Especular De Não Contato

Brandão¹,

Ranzani²,

Rodrigues³

et al. 2006

AVS

View full text Add to dashboard Cite

RESUMO -O propósito do presente trabalho foi avaliar os valores da espessura corneana central em córneas de ovinos sadios com o microscópio especular de não-contato e paquímetro ultra-sônico. A espessura corneana central foi determinada em 22 olhos de 11 ovinos, inicialmente com microscópio especular de não-contato (Topcon SP-2000P), seguido pelo paquímetro ultra-sônico (Nidek UP-1000). Os valores médios das medidas corneanas centrais foram 654mm e 665mm com o microscópio especular de não contato e o paquímetro ultra-sônico, respectivamente. As medidas da espessura corneana demonstraram que ambos os instrumentos são confiáveis. Palavras-chave:Ovino. Paquimetria. Especular. Ultrasônica. Espessura corneana.ABSTRACT -The purpose of this study was to evaluate the central corneal thickness values in normal ovine with Topcon SP-2000P noncontact specular microscope and ultrasonic pachymeter. Central corneal thickness was detemined in 22 eyes of 11 ovines, first with a noncontact specular microscopy (Topcon SP-2000P), then using an ultrasonic pachgmeter (Nidek UP-1000). The central corneal measurements were 654mm e 665mm with Topcon and ultrasonic pachymeter, respectively. The instruments were reliable in their measurements.

show abstract

“…In order to reduce endothelial injury, the following alternatives have been developed: viscoelastic substances (12)(13)(14)(15) ; special surgical techniques such as, for example, nuclear prefracture; and new modalities of tip vibration at ultrasonic frequency, such as the White-star ® , Neosonix ® , dynamic rising time and torsional systems (1,2,5,6,(16)(17)(18)(19)(20)(21)(22)(23) . By the year 2000, an alternative technology was proposed for cataracts surgery (5,16,17) .…”

Section: Introductionmentioning

confidence: 99%

Comparison of central corneal edema and visual recovery between liquefaction and conventional phacoemulsification in soft cataracts

Nakano¹,

Hida²,

Kara‐José³

et al. 2009

Rev. bras.oftalmol.

View full text Add to dashboard Cite

Purpose:The aim of the present study is to assess central corneal edema and visual recovery after cataract surgery performed according to two technologies: conventional ultrasonic and liquefaction (Aqualase ® ). Methods: This is a prospective contralateral study in wich 20 patients with comparable preoperative conditions were submitted to cataract surgery were evaluated. Preoperative assessment involved complete ophthalmological examination and the study included patients with bilateral cataracts up to grade 2, according to the Lens Opacity Classification System II. The same cristaline fracture technique was used in all cases, and surgical procedures were performed by the same experienced surgeon, using two technologies: liquefaction or conventional phacoemulsification. Postoperative central corneal edema was measured by corneal optical pachymetry (Orbscan II ® ) on the 1 st , 3 rd , 7 th and 10 th postoperative days. Results: None of the 20 patients submitted to surgery was lost during the postoperative follow-up or excluded from the analysis. On the first postoperative, the visual acuity average was 0.031 logMAR in the Aqualase ® group and 0.043 logMAR in the conventional surgery group. No statistical difference was detected in the assessment of visual acuity throughout the postoperative period. Central corneal pachymetry varied from 543.93 + 34.69 preoperatively to 545.08 ± 25.67 on the last day of follow-up in the Aqualase ® group, and from 543.13 + 30.62 to 536.08 + 34.89 in the conventional technique group, without statistical significance. Conclusion: This study suggests that both techniques are equally effective for surgery on lenses with grade I or II cataract, and that they provide similar results in terms of visual recovery and central corneal edema.

show abstract

Quantitative Anatomical Differences in Central Corneal Thickness Values Determined With Scanning-Slit Corneal Topography and Noncontact Specular Microscopy

Abstract: Researchers should know of the existence of this difference between noncontact specular microscopy and Orbscan pachymetry when interpreting central corneal thickness values.

Cited by 19 publications

References 19 publications

Discrepancy between central and midperipheral corneal thickness measurements obtained with slit-scanning pachymetry and noncontact specular microscopy

Discrepancy between central and midperipheral corneal thickness measurements obtained with slit-scanning pachymetry and noncontact specular microscopy

Mensuração Da Espessura Corneana Em Ovinos Com Paquimetria Ultra-Sônica E Microscopia Especular De Não Contato

Comparison of central corneal edema and visual recovery between liquefaction and conventional phacoemulsification in soft cataracts

Contact Info

Product

Resources

About