scholarly journals Postkeratoplasty Anterior and Posterior Corneal Surface Wavefront Analysis: Descemet’s Stripping Automated Endothelial Keratoplasty versus Penetrating Keratoplasty

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Maria L. Salvetat ◽  
Marco Zeppieri ◽  
Flavia Miani ◽  
Paolo Brusini
Keyword(s):  
Penetrating Keratoplasty ◽  
Imaging System ◽  
Case Series ◽  
Optical Quality ◽  
Endothelial Keratoplasty ◽  
Corneal Surface ◽  
Scheimpflug Imaging ◽  
Quality Of Vision ◽  
Range Test

Purpose. To compare the higher-order aberrations (HOAs) due to the anterior and posterior corneal surfaces in patients that underwent either Descemet-stripping-automated-endothelial-keratoplasty (DSAEK) or penetrating keratoplasty (PK) for endothelial dysfunction and age-matched controls. Methods. This retrospective, observational, case series included 28 patients after PK, 30 patients after DSAEK, and 30 healthy controls. A Scheimpflug imaging system was used to assess the HOAs due to the anterior and posterior corneal surfaces at 4 mm and 6 mm optical zones. Total, 3rd and 4th order HOAs were considered. Intra- and intergroup differences were assessed using the Friedman and the Kruskal-Wallis tests, respectively; paired comparisons were performed using Duncan's multiple range test. Results. Total, 3rd and 4th order HOAs due to both corneal surfaces at 4 mm and 6 mm optical zones were significantly higher in the PK group, intermediate in the DSAEK group, and lower in controls (). The most important HOAs components in both PK and DSAEK groups were trefoil and coma from the anterior corneal surface () and trefoil from the posterior corneal surface (). Conclusions. The optical quality of both corneal surfaces appeared significantly higher after DSAEK than after PK, which can increase the postoperative patient's quality of vision and satisfaction.

scholarly journals Clinical outcomes with a diffractive trifocal intraocular lens

2018 ◽  
Vol 28 (4) ◽  
pp. 419-424 ◽  
Author(s):  
Jorge L Alió ◽  
Ana B Plaza-Puche ◽  
Jorge L Alió del Barrio ◽  
Pedro Amat-Peral ◽  
Vicente Ortuño ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Contrast Sensitivity ◽  
Intraocular Lens ◽  
Case Series ◽  
Optical Quality ◽  
Near Vision ◽  
Case Series Study ◽  
Defocus Curve ◽  
Near Visual Acuity

Purpose: To evaluate clinical and visual outcomes, quality of near vision, and intraocular optical quality of patients bilaterally implanted with a trifocal PanOptix intraocular lens. Methods: In this prospective consecutive case-series study, 52 eyes of 26 bilateral patients (mean age, 60.2 ± 7.4 years) were implanted with the AcrySof IQ Panoptix intraocular lens. Visual acuity, defocus curve, contrast sensitivity (Pelli-Robson test), near activity visual questionnaire, and internal aberrations with Osiris were evaluated. A prototype light-distortion analyzer was used to quantify the postoperative light-distortion indices. The follow-up was 6 months after surgery. Results: Uncorrected, corrected distance, and uncorrected near visual acuities improved with the surgery (p ≤ 0.02). Distance corrected near visual acuity was 0.13 ± 0.10, 0.13 ± 0.13, and 0.13 ± 0.08 at 1, 3, and 6 months after surgery, respectively (p = 0.82). Distance corrected intermediate visual acuities were 0.09 ± 0.13, 0.13 ± 0.15, and 0.12 ± 0.12 at 1, 3, and 6 months, postoperatively. Binocular contrast sensitivity was 1.86 ± 0.15 Log Units. Defocus curve provided a visual acuity equal or better to 0.30 LogMAR between defocus levels of +0.50 to −3.00 D. The near activity visual questionnaire scores improved significantly with the surgery (p < 0.01). Conclusion: The AcrySof IQ Panoptix intraocular lens is able to restore visual function with an acceptable intermediate and near vision after cataract surgery with good contrast sensitivity and an improvement in the near activity visual questionnaire.

Keratoconic Bi-aspheric Contact Lenses

2016 ◽  
Vol 5 (3) ◽  
pp. 132-138
Author(s):  
Ariela Gordon-Shaag ◽  
Philip Fine ◽  
Liat Gantz ◽  
Arige Gideon-Abousaid ◽  
Gad Serero
Keyword(s):  
Visual Acuity ◽  
Contact Lenses ◽  
Case Series ◽  
Visual Stability ◽  
Wavefront Aberrations ◽  
Body Sensation ◽  
Quality Of Vision ◽  
Base Curve ◽  
Aspheric Lenses

ABSTRACT Aim This observational clinical case series examined patients with keratoconus (KC) fit with keratoconic bi-aspheric (KBA) lenses to assess visual acuity (VA), wavefront aberrations, physiological fitting, subjective comfort, and manufacturer's fitting guidelines. Materials and methods Seven adult patients (11 eyes, four females, mean age: 34.15 ± 14.12) with nipple cones from the Hadassah Academic College contact lens clinic (Jerusalem, Israel) were fit with KBA lenses by modifying the initial base curve (BC) to obtain an acceptable physiological fit. The uncorrected and corrected distance (D) and near (N) Snellen VA and the ocular wavefront measurements, and responses to a self-administered five-point scale questionnaire were compared after 2 weeks of wear using paired two-tailed t-test or Mann-Whitney U test, as appropriate. Results Visual acuity and total root mean square (RMS) improved significantly with the lenses (DVAuncorrected = 0.04 ± 0.02, DVAcorrected = 0.66 ± 0. 22, NVAuncorrected = 0.34 ± 0.30, NVAcorrected = 0.95 ± 0.12). Subjects reported an average of 7.0 ± 2.7 hours of wear daily, with good scores in visual stability, satisfaction with VA and quality of vision, improvement of mood and quality of life, and low scores in foreign body sensation, pain, red eye, and itching during wear, and difficulty with lens removal. An average of two BC modifications from the diagnostic lens were necessary (0.16 mm steeper in nine eyes, 0.27 mm flatter in two eyes). Conclusion Keratoconic bi-aspheric lenses can provide 7 hours of comfortable wear, significantly improved VA and total RMS aberrations, alongside subjective satisfaction. Base curve modifications can be reduced by fitting a diagnostic lens 0.75 mm steeper than the flattest keratometry reading. How to cite this article Gantz L, Gordon-Shaag A, Gideon-Abousaid A, Serero G, Fine P. Keratoconic Bi-aspheric Contact Lenses. Int J Kerat Ect Cor Dis 2016;5(3):132-138.

Corneal power measurement with a rotating Scheimpflug imaging system after Descemet-stripping automated endothelial keratoplasty

2010 ◽  
Vol 36 (8) ◽  
pp. 1358-1364 ◽  
Author(s):  
Pawan Prasher ◽  
Orkun Muftuoglu ◽  
Wayne R. Bowman ◽  
Dwight H. Cavanagh ◽  
James P. McCulley ◽  
...  
Keyword(s):  
Imaging System ◽  
Power Measurement ◽  
Endothelial Keratoplasty ◽  
Corneal Power ◽  
Scheimpflug Imaging

scholarly journals On the Relationship between Corneal Biomechanics, Macrostructure and Optical Properties

2021 ◽  
Author(s):  
Francisco J. Ávila ◽  
Laura Remón ◽  
Maria Concepción Marcellán
Keyword(s):  
Optical Properties ◽  
Biomechanical Properties ◽  
Optical Quality ◽  
Optical Transparency ◽  
Optical Aberrations ◽  
Corneal Aberrations ◽  
Scheimpflug Imaging ◽  
The Hierarchical Structure ◽  
The Relationship

Optical properties of the cornea are responsible for correct vision, ultrastructure allows optical transparency and biomechanical properties governs the shape, elasticity or stiffness of the cor-nea affecting ocular integrity and intraocular pressure. Therefore, optical aberrations, corneal transparency, structure and biomechanics play a fundamental role in the optical quality of hu-man vision, ocular health and refractive surgery outcomes. However, the convergence of those properties is not yet reported at macroscopic scale within the hierarchical structure of the cornea. This work explores the relationships between biomechanics, structure and optical properties (corneal aberrations and optical density) at macrostructural level of the cornea through dual Placido-Scheimpflug imaging and air-puff tonometry systems in a healthy young adult popula-tion. Results showed convergence between optical transparency, corneal macrostructure and biomechanics.

scholarly journals Quality of vision after ultrathin descemet stripping automated endothelial keratoplasty: a multicentre randomized clinical trial

2019 ◽  
Vol 97 (4) ◽  
pp. e671-e672 ◽  
Author(s):  
Mor M. Dickman ◽  
Suryan L. Dunker ◽  
Pieter J. Kruit ◽  
Lies Remeijer ◽  
Jeroen Rooij ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Randomized Clinical Trial ◽  
Endothelial Keratoplasty ◽  
Quality Of Vision

scholarly journals Quality of Vision after Deep Anterior Lamellar Keratoplasty (Fluid Dissection) Compared to Penetrating Keratoplasty for the Treatment of Keratoconus

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Islam Mahmoud Hamdi ◽  
Momen Mahmoud Hamdi
Keyword(s):  
Penetrating Keratoplasty ◽  
Complete Removal ◽  
Quality Parameters ◽  
Optical Quality ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Modulation Transfer ◽  
Cross Sectional ◽  
Anterior Lamellar Keratoplasty

Purpose. To compare the visual quality of patients with keratoconus who underwent penetrating keratoplasty (PKP) or deep anterior lamellar keratoplasty (DALK) with fluid dissection. Design. Cross-sectional, observational study. Methods. Twelve eyes that underwent PKP (PKP group) were compared to 24 eyes that underwent DALK (DALK group) after complete removal of sutures and stability of refraction. Visual, refractive, corneal topographic, corneal aberrometry, and ocular aberrometry parameters were compared for both groups. The χ2 and Mann–Whitney U tests were used for comparisons as appropriate. P<0.05 was considered statistically significant. Results. Uncorrected and best spectacle-corrected visual acuity (UCVA and BSCVA, resp.), mean refractive spherical equivalent and mean refractive cylinder (MRSE and MRC, resp.), root mean square of the 3 mm and 5 mm OPD Scan (NIDEK Co. Ltd., Gamagori, Japan), steep and flat meridians (SimK1 and SimK2, resp.), and the difference (corneal cylinder) were not statistically significantly different between groups (P>0.05, all comparisons). All aberrations, point spread functions (PSF), and the modulation transfer function (MTF) were not statistically different between groups (P>0.05). Conclusion. For our small study, the postoperative PKP and DALK with fluid dissection patient groups had vision/optical quality parameters that were not statistically different. This may indicate that DALK with fluid dissection can replace PKP for keratoconus without compromising vision quality.

Comparison of Anterior and Posterior Corneal Surface Irregularity in Descemet Stripping Automated Endothelial Keratoplasty and Penetrating Keratoplasty

Cornea ◽  
2010 ◽  
Vol 29 (10) ◽  
pp. 1086-1090 ◽  
Author(s):  
Takefumi Yamaguchi ◽  
Kazuno Negishi ◽  
Kazuko Yamaguchi ◽  
Murat Dogru ◽  
Yuichi Uchino ◽  
...  
Keyword(s):  
Penetrating Keratoplasty ◽  
Surface Irregularity ◽  
Endothelial Keratoplasty ◽  
Corneal Surface

scholarly journals Changes of Corneal Wavefront Aberrations in Dry Eye Patients after Treatment with Artificial Lubricant Drops

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Ning Lu ◽  
Fangyu Lin ◽  
Zhu Huang ◽  
Qin He ◽  
Wei Han
Keyword(s):  
Dry Eye ◽  
Spherical Aberration ◽  
Optical Quality ◽  
Control Group ◽  
Eye Drops ◽  
Artificial Eye ◽  
Corneal Surface ◽  
Wavefront Aberrations ◽  
Corneal Aberrations

Purpose.To evaluate the corneal aberration changes in dry eye patients after treatment with artificial eye drops.Methods.Thirty mild to moderate dry eye patients treated with artificial eye drops and twenty comparable dry eye patients were recruited as controls. Anterior corneal aberrations over 3 mm and 5 mm analytical zones including total, 3rd to 5th high order aberrations (HOAs), spherical aberration (SA), and vertical (V-coma) and horizontal coma (H-coma) obtained from corneal topography data at baseline and 2 weeks after treatment were evaluated.Results.For 3 mm zone, trefoils, V-coma, H-coma terms, and 3rd and 5th HOAs were significantly decreased (p<0.05) in the treatment group. For 5 mm zone, instillation of eye drops reduced H-coma, SA terms, 3rd to 5th orders, and total HOAs all showed a significant decrease (p<0.05). The root mean square analysis of the Zernike terms also showed similar statistical results. For control group, all individual terms and total HOAs did not have significant changes over 3 mm and 5 mm zones (p>0.05).Conclusions.Treatment with artificial eye drops can effectively improve the corneal optical quality of dry eye patients by ameliorating the HOAs of anterior corneal surface.

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