scholarly journals Comparison of penetrating keratoplasty outcomes with or without microwave thermokeratoplasty

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Osamu Hieda ◽  
Koichi Wakimasu ◽  
Shigeru Kinoshita ◽  
Chie Sotozono
Keyword(s):  
Visual Acuity ◽  
Standard Deviation ◽  
Femtosecond Laser ◽  
Penetrating Keratoplasty ◽  
Corneal Topography ◽  
Central Cornea ◽  
Regularity Index ◽  
Minimum Angle ◽  
The Mean ◽  
Surface Regularity

AbstractMicrowave thermokeratoplasty (MTK) is a surgical procedure for the correction of pathologic corneal steepening. The purpose of this study was to examine the postoperative outcomes of eyes with advanced keratoconus that underwent femtosecond-laser zig-zag penetrating keratoplasty (z-PK) following MTK for reshaping of the central cornea. This study involved 32 eyes of 32 consecutive advanced keratoconus patients; i.e., 25 eyes of 25 patients who underwent MTK prior to z-PK (MTK + z-PK group), and 7 eyes of 7 patients who underwent z-PK alone (z-PK group). In all treated eyes, visual acuity (VA) and corneal topography were measured before surgery and at 6-months postoperative. At 6-months postoperative, the mean uncorrected distance VA (logarithm of the minimum angle of resolution) and surface regularity index (SRI) of the MTK + z-PK group was 0.62 ± 0.39 (mean ± standard deviation) and 1.26 ± 0.45, respectively, while that in the z-PK group was 1.02 ± 0.18 and 7.64 ± 3.22, respectively. Both variables were significantly better in the MTK + z-PK group than in the z-PK group (P < 0.05). The findings in this study reveal that MTK prior to z-PKP is effective for improving UDVA and reducing the irregularity of corneal topography in patients with advanced keratoconus.

scholarly journals Femtosecond laser-assisted cataract surgery compared with phacoemulsification: the FACT non-inferiority RCT

2021 ◽  
Vol 25 (6) ◽  
pp. 1-68
Author(s):  
Alexander C Day ◽  
Jennifer M Burr ◽  
Kate Bennett ◽  
Rachael Hunter ◽  
Catey Bunce ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Standard Deviation ◽  
Confidence Interval ◽  
Femtosecond Laser ◽  
Cataract Surgery ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Corrected Distance Visual Acuity ◽  
The Mean

Background Cataract surgery is one of the most common operations. Femtosecond laser-assisted cataract surgery (FLACS) is a technique that automates a number of operative steps. Objectives To compare FLACS with phacoemulsification cataract surgery (PCS). Design Multicentre, outcome-masked, randomised controlled non-inferiority trial. Setting Three collaborating NHS hospitals. Participants A total of 785 patients with age-related cataract in one or both eyes were randomised between May 2015 and September 2017. Intervention FLACS (n = 392 participants) or PCS (n = 393 participants). Main outcome measures The primary outcome was uncorrected distance visual acuity in the study eye after 3 months, expressed as the logarithm of the minimum angle of resolution (logMAR): 0.00 logMAR (or 6/6 if expressed in Snellen) is normal (good visual acuity). Secondary outcomes included corrected distance visual acuity, refractive outcomes (within 0.5 dioptre and 1.0 dioptre of target), safety and patient-reported outcome measures at 3 and 12 months, and resource use. All trial follow-ups were performed by optometrists who were masked to the trial intervention. Results A total of 353 (90%) participants allocated to the FLACS arm and 317 (81%) participants allocated to the PCS arm attended follow-up at 3 months. The mean uncorrected distance visual acuity was similar in both treatment arms [0.13 logMAR, standard deviation 0.23 logMAR, for FLACS, vs. 0.14 logMAR, standard deviation 0.27 logMAR, for PCS, with a difference of –0.01 logMAR (95% confidence interval –0.05 to 0.03 logMAR; p = 0.63)]. The mean corrected distance visual acuity values were again similar in both treatment arms (–0.01 logMAR, standard deviation 0.19 logMAR FLACS vs. 0.01 logMAR, standard deviation 0.21 logMAR PCS; p = 0.34). There were two posterior capsule tears in the PCS arm. There were no significant differences between the treatment arms for any secondary outcome at 3 months. At 12 months, the mean uncorrected distance visual acuity was 0.14 logMAR (standard deviation 0.22 logMAR) for FLACS and 0.17 logMAR (standard deviation 0.25 logMAR) for PCS, with a difference between the treatment arms of –0.03 logMAR (95% confidence interval –0.06 to 0.01 logMAR; p = 0.17). The mean corrected distance visual acuity was 0.003 logMAR (standard deviation 0.18 logMAR) for FLACS and 0.03 logMAR (standard deviation 0.23 logMAR) for PCS, with a difference of –0.03 logMAR (95% confidence interval –0.06 to 0.01 logMAR; p = 0.11). There were no significant differences between the arms for any other outcomes, with the exception of the mean binocular corrected distance visual acuity with a difference of –0.02 logMAR (95% confidence interval –0.05 to 0.00 logMAR) (p = 0.036), which favoured FLACS. There were no significant differences between the arms for any health, social care or societal costs. For the economic evaluation, the mean cost difference was £167.62 per patient higher for FLACS (95% of iterations between –£14.12 and £341.67) than for PCS. The mean QALY difference (FLACS minus PCS) was 0.001 (95% of iterations between –0.011 and 0.015), which equates to an incremental cost-effectiveness ratio (cost difference divided by QALY difference) of £167,620. Limitations Although the measurement of outcomes was carried out by optometrists who were masked to the treatment arm, the participants were not masked. Conclusions The evidence suggests that FLACS is not inferior to PCS in terms of vision after 3 months’ follow-up, and there were no significant differences in patient-reported health and safety outcomes after 12 months’ follow-up. In addition, the statistically significant difference in binocular corrected distance visual acuity was not clinically significant. FLACS is not cost-effective. Future work To explore the possible differences in vision in patients without ocular co-pathology. Trial registration Current Controlled Trials ISRCTN77602616. Funding This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25, No. 6. See the NIHR Journals Library website for further project information. Moorfields Eye Charity (grant references GR000233 and GR000449 for the endothelial cell counter and femtosecond laser used).

Topographically Guided Two-Step LASIK and Standard LASIK in the Correction of Refractive Errors after Penetrating Keratoplasty

2009 ◽  
Vol 19 (4) ◽  
pp. 535-543 ◽  
Author(s):  
Leopoldo Spadea ◽  
Massimo Saviano ◽  
Angela Di Gregorio ◽  
Domenico Di Lodovico ◽  
Fabio De Sanctis
Keyword(s):  
Visual Acuity ◽  
Penetrating Keratoplasty ◽  
Laser In Situ Keratomileusis ◽  
Refractive Errors ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
The Mean ◽  
Group 2 ◽  
Group 1

Purpose To evaluate in a long-term period the effectiveness and safety of topographically guided two-step laser in situ keratomileusis (LASIK) and standard LASIK technique in the correction of refractive errors after successful penetrating keratoplasty (PKP) for keratoconus. Methods At least 2 years after PKP and 6 months after removal of all sutures, 15 eyes of 15 patients (Group 1; mean manifest refraction spherical equivalent (MRSE) −7.23 D ± 3.42 SD) were submitted to standard LASIK and 15 eyes of 15 patients (Group 2; mean MRSE −4.37 D ± 1.97 SD) to a topographically guided two-step LASIK procedure (first the flap and at least 2 weeks later the laser ablation). In all cases, a superior hinged corneal flap (160 μm/9.5 mm) was created. Results After a follow-up of 36 months, in Group 1 the mean uncorrected visual acuity (UCVA) was 0.51 logarithm of the minimum angle of resolution (logMAR) ± 0.41 SD and the mean best-corrected visual acuity (BCVA) was 0.03 logMAR ± 0.05 SD, with a mean MRSE of −1.57 D ± 2.65 SD. In Group 2, the mean UCVA was 0.28 logMAR ± 0.24 SD and the mean BCVA was 0.01 logMAR ± 0.03 SD, with a mean MRSE of −0.07 D ± 1.00 SD. In both groups, no complications were observed. Conclusions After a long follow-up period, both topographically guided two-step LASIK and standard LASIK could be considered effective and safe tools in the correction of refractive errors after successful PKP for keratoconus.

scholarly journals The Effect of Pterygium Surgery on Corneal Topography

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
N M Welson ◽  
M M M Samy ◽  
A A Gaafar ◽  
T A Badran
Keyword(s):  
Visual Acuity ◽  
Surgical Treatment ◽  
Corneal Topography ◽  
Surgical Removal ◽  
Significant Difference ◽  
Uncorrected Visual Acuity ◽  
Pterygium Surgery ◽  
The Mean ◽  
Pterygium Excision ◽  
Topographic Astigmatism

Abstract Objective To evaluate the effect of pterygium surgery on corneal topography by comparing wave front analysis before and one month after the surgical treatment. Methodology Fifty eyes of forty-one patients were included in this study. Twenty five male and sixteen female patients seeking pterygium surgery were recruited from the Ophthalmology Department Outpatient Clinic in Sohag Teaching Hospital during the period from July 2017 to May 2018. All eyes underwent pterygium excision with conjunctival autograft. Results In this study we found a highly statistically significant improvement in the mean uncorrected visual acuity from 0.44±0.21SD preoperatively to 0.62±0.18SD postoperatively (p &lt; 0.001) and a highly statistically significant difference in the mean logMAR visual acuity as it was decreased from 0.43±0.28 SD preoperatively to 0.34±0.23 SD postoperatively (p &lt; 0.001). Also, there was a highly statistically significant improvement in mean of manifest refractive astigmatism from -4.08±3.28 SD preoperatively to -1.46±1.40 SD postoperatively (p &lt; 0.001). We also found a highly statistically significant improvement in the mean cycloplegic astigmatism from -4.00±3.01 SD preoperatively to -1.39±1.33 SD postoperatively (p &lt; 0.001) and also there was a highly statistically significant improvement in the mean topographic astigmatism from -5.17±4.08 SD preoperatively to -2.20±2.31 SD postoperatively (p &lt; 0.001). We also found a highly statistically significant improvement in the mean of ISV (Index of Surface Variance) from 76.22±36.86 SD preoperatively to 33.56±15.02 SD post operatively (p &lt; 0.001) and also there was a highly statistically significant improvement in the mean IHD (Index of Height Decentration) from 0.042±0.027SD pre-operatively to 0.023±0.036 SD post operatively. Conclusion There was a highly statistically significant difference in the mean logMAR visual acuity and a highly statistically significant improvement in the mean uncorrected visual acuity. A highly statistically significant improvement in both refractive and topographic astigmatism after one month of the surgery was noted also. Here were also a highly statistically significant improvement in ISV and IHD that indicate improvement after pterygium removal. Recommendations Patient with pterygium that inducing astigmatism will benefit from surgical removal of the pterygium.

scholarly journals Quality of eyeglass prescriptions from a low-cost wavefront autorefractor evaluated in rural India: results of a 708-participant field study

2019 ◽  
Vol 4 (1) ◽  
pp. e000225 ◽  
Author(s):  
Nicholas J Durr ◽  
Shivang R Dave ◽  
Daryl Lim ◽  
Sanil Joseph ◽  
Thulasiraj D Ravilla ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Form Factor ◽  
Low Cost ◽  
Rural India ◽  
Resource Setting ◽  
Low Resource Setting ◽  
Significant Difference ◽  
Minimum Angle ◽  
The Mean

ObjectiveTo assess the quality of eyeglass prescriptions provided by an affordable wavefront autorefractor operated by a minimally trained technician in a low-resource setting.Methods and Analysis708 participants were recruited from consecutive patients registered for routine eye examinations at Aravind Eye Hospital in Madurai, India, or an affiliated rural satellite vision centre. Visual acuity (VA) and patient preference were compared between trial lenses set to two eyeglass prescriptions from (1) a novel wavefront autorefractor and (2) subjective refraction by an experienced refractionist.ResultsThe mean±SD VA was 0.30±0.37, –0.02±0.14 and −0.04±0.11 logarithm of the minimum angle of resolution units before correction, with autorefractor correction and with subjective refraction correction, respectively (all differences p<0.01). Overall, 25% of participants had no preference, 33% preferred eyeglass prescriptions from autorefraction, and 42% preferred eyeglass prescriptions from subjective refraction (p<0.01). Of the 438 patients 40 years old and younger, 96 had no preference and the remainder had no statistically significant difference in preference for subjective refraction prescriptions (51%) versus autorefractor prescriptions (49%) (p=0.52).ConclusionAverage VAs from autorefractor-prescribed eyeglasses were one letter worse than those from subjective refraction. More than half of all participants either had no preference or preferred eyeglasses prescribed by the autorefractor. This marginal difference in quality may warrant autorefractor-based prescriptions, given the portable form factor, short measurement time, low cost and minimal training required to use the autorefractor evaluated here.

Outcomes After the Use of Silicone Oil in Complex Retinal Detachment Repair

2020 ◽  
Vol 4 (2) ◽  
pp. 96-102
Author(s):  
Omar A. Saleh ◽  
Efrat Fleissig ◽  
Charles C. Barr
Keyword(s):  
Visual Acuity ◽  
Retinal Detachment ◽  
Chart Review ◽  
Silicone Oil ◽  
Retrospective Chart Review ◽  
Final Visit ◽  
Complication Rates ◽  
Minimum Angle ◽  
The Mean ◽  
Better Than

Purpose: This study compares visual acuity (VA), anatomic outcomes, and complications in eyes that underwent complex retinal detachment (RD) repair in which silicone oil (SO) was retained vs removed. Methods: A retrospective chart review of patients undergoing vitrectomy with SO tamponade. The eyes were divided into 2 groups based upon SO removal or retention. Main outcome measures were corrected VA, anatomic outcomes, and the presence of SO-related complications. Results: Fifty-seven eyes with removed SO and 53 eyes with retained SO were identified. In both groups, the mean best-corrected VA (BCVA) at the final visit was significantly better than at baseline. In the retained-SO group, vision improved from 1.79 ± 0.6 to 1.2 ± 0.7 logarithm of the minimum angle of resolution (logMAR) (Snellen, 20/1200 to 20/350) at the final visit ( P < .001). In the removed-SO group, mean BCVA improved from 1.84 ± 0.5 at baseline to 1.55 ± 0.6 logMAR units (Snellen, 20/1400 to 20/700) at the visit preceding SO removal ( P < .002) and to 1.43 ± 0.6 logMAR units (Snellen, 20/500) at the final visit ( P < .001). Complication rates were similar in both groups, apart from RD, which occurred more frequently in the removed-SO group ( P = .03). Conclusions: There was similarity in VA and complications among patients with removed or retained SO. Removal of SO may benefit eyes with SO-related complications, but SO retention may decrease the chance of RD and may be indicated in selected cases.

scholarly journals Refractive, Topographic, and Aberrometric Results at 2-Year Follow-Up for Accelerated Corneal Cross-Link for Progressive Keratoconus

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ercüment Bozkurt ◽  
Engin Bilge Ozgurhan ◽  
Betul Ilkay Sezgin Akcay ◽  
Tugba Kurt ◽  
Yusuf Yildirim ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Spherical Aberration ◽  
Corneal Thickness ◽  
Corneal Topography ◽  
Wavefront Aberration ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Wavefront Error ◽  
The Mean

Purpose. To report the visual, refractive, and corneal topography and wavefront aberration results of accelerated corneal cross-linking (CXL) during a 24-month follow-up.Methods. Forty-seven eyes underwent riboflavin-ultraviolet A-induced accelerated CXL treatment (30 mW/cm2with a total dose of 7.2 joules/cm2). Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical and cylindrical values, keratometry (K) measurements (Ksteep,Kflat,Kavg, andKapex), central corneal thickness, and anterior corneal aberrometric analyses including total wavefront error (WFE), total high order aberration (HOA), astigmatism, trefoil, coma, quadrafoil, secondary astigmatism, and spherical aberration were evaluated.Results. The mean UDVA and CDVA were significantly improved at 1 (p=0.003andp=0.004, resp.) and 2 years after treatment (p=0.001andp=0.001, resp.). The meanKsteep,Kflat,Kaverage, andKapexvalues were significantly lower than baseline at 12 months (p=0.008,p=0.024,p=0.001, andp=0.014, resp.) and 24 months (p=0.014,p=0.017,p=0.001, andp=0.012, resp.). Corneal thickness showed a significant decrease at 1 month. Total HOA and coma decreased significantly at the 12-month (p=0.001andp=0.009, resp.) and 24-month visits (p=0.001andp=0.007, resp.).Conclusion. Accelerated CXL (30 mW/cm2) was found to be effective in improving UDVA, CDVA, corneal topography readings, total HOA, and coma aberrations during the 24-month follow-up.

scholarly journals Quantification of Ocular Parameters To Create An Anatomical Eye Model for The Japanese Population

2021 ◽  
Author(s):  
Takushi Kawamorita ◽  
Hiroshi Uozato ◽  
Tetsuro Oshika ◽  
Kazuno Negishi ◽  
Takashi Fujikado ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
Age Related ◽  
Corrected Distance Visual Acuity ◽  
Minimum Angle ◽  
Refractive Correction ◽  
Corneal Asphericity ◽  
The Mean ◽  
Posterior Corneal Curvature

Abstract This prospective observational study aimed to evaluate the eye shape and visual function of Japanese people through a multicenter approach and to create a Japanese model eye. Uncorrected and corrected distance visual acuity (UDVA and CDVA, respectively) in the log minimum angle of resolution (logMAR), subjective and objective spherical equivalent values (SE) of ocular refraction, anterior and posterior corneal curvature (ACC and PCC, respectively), anterior and posterior corneal asphericity (ACA and PCA, respectively), central corneal thickness (CCT), anterior chamber depth (ACD), and ocular axial length (AL) were measured in the eyes of 250 participants (mean age = 46.5 ± 18.0 years, range: 20–90 years) across five institutions in Japan. The mean UDVA, CDVA, subjective SE, objective SE, ACC, PCC, ACA, PCA, CCT, ACD, and AL were 0.68, -0.08, -2.42 D, -2.66 D, 7.77 mm, 6.33 mm, -0.31, -0.39, 0.55 mm, 2.92 mm, and 24.78 mm, respectively. Age-related changes and sex-based differences were observed in the visual acuity, refraction, corneal shape, ACD, and AL. Although the sample size needs to be increased, the results of this study can be applied to the development of refractive correction methods and various vision-related fields.

scholarly journals Correction of postkeratoplastic astigmatism by intrastromal corneal segments implantation using a femtosecond laser

2021 ◽  
Vol 6 (6-1) ◽  
pp. 48-55
Author(s):  
N. A. Pozdeyeva ◽  
M. V. Sinitsyn ◽  
A. E. Terentieva ◽  
O. V. Shlenskaya
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Penetrating Keratoplasty ◽  
Biomechanical Properties ◽  
Corneal Graft ◽  
Corneal Resistance Factor ◽  
Astigmatism Correction ◽  
Corrected Visual Acuity ◽  
Uncorrected Visual Acuity ◽  
Best Corrected Visual Acuity

Background. After penetrating keratoplasty, mild to high induced corneal astigmatism was observed in each case. The existing choice of correction of postkeratoplastic astigmatism is aimed at fi nding an individual approach in order to compensate for it and not weaken the biomechanical properties of the corneal graft.The aim: to analyze the clinical, functional, and morphological results of postkeratoplastic astigmatism correction by implantation of intrastromal corneal segments using a femtosecond laser.Methods. 22 patients were examined before and 1 year after surgery. The operation was performed under local anesthesia: stage I – an intrastromal tunnel was formed using a femtosecond laser “Femto Visum” 1 MHz (Optosystems, Russia); stage II – the intrastromal corneal segments were implanted. The results were assessed using standard and special research methods using optical coherence tomography Visante OCT (Zeiss, Germany), keratotopography (Tomey-5, Japan), optical corneal analyzer ORA (Reichert, USA), laser tindalemetry FC-2000 (Kowa, Japan) and confocal microscope Confoscan-4 (Nidek, Japan).Results. Before the operation, uncorrected visual acuity averaged 0.09 ± 0.05, after a year – 0.50 ± 0.16; best corrected visual acuity – 0.30 ± 0.12 and 0.60 ± 0.05 respectively; cylindrical component of refraction – –10.29 ± 3.12 and –2.20 ± 0.64 D respectively; mean keratometry value – 43.59 ± 2.14 and 38.56 ± 1.75 D respectively; corneal hysteresis – 7.92 ± 1.22 and 8.95 ± 1.05 mm Hg respectively; corneal resistance factor – 7.01 ± 1.81 and 8.44 ± 1.44 mm Hg respectively; protein fl ux in the moisture of the anterior chamber – 2.97 ± 0.28 and 3.04 ± 0.24 f/ms respectively; endothelial cell density – 1521 ± 327 and 1475 ± 419 cells/mm2 respectively.Conclusion. Intrastromal corneal segments implantation into a corneal graft using a femtosecond laser has efficiency and safety method in correcting postkeratoplastic astigmatism.

Clinical effectiveness of intrastromal corneal ring segments among keratoconus patients

2020 ◽  
Vol 1 (3) ◽  
pp. 140-144
Author(s):  
Abdullhamid Alghamdi ◽  
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Surgical Intervention ◽  
Clinical Effectiveness ◽  
Ophthalmic Examination ◽  
Visual Outcomes ◽  
Intrastromal Corneal Ring ◽  
Uncorrected Visual Acuity ◽  
The Mean

AIM: To evaluate the clinical effectiveness of intrastromal corneal ring segments (ICRS) among the patients suffering from keratoconus. METHODS: A retrospective and non-comparative interventional design had been utilized on the basis of postoperative follow-up among 56 keratoconus patients. Visual acuity was significantly assessed during complete ophthalmic examination of the patients. The femtosecond laser had been used to create the corneal tunnels in 15 eyes; whereas, the corneal tunnels were created in 72 eyes mechanically. RESULTS: The ranges and standard deviations had been used to obtain results. It had been revealed through ophthalmic assessment that the mean preoperative uncorrected visual acuity observed was 1.38±0.37 logarithm of Minimal Angle of Resolution. Moreover, a significant improvement was observed postoperatively in visual acuity by 0.58±0.32 during the 4th month. The improvement was also witnessed in the 16th month by 0.48±0.30. CONCLUSION: The implantation of ICRS is an efficient and effective surgical intervention for the treatment of keratoconus. Thus, identified intervention seems to be associated with appropriate visual outcomes and safety after the development of femtosecond as well as mechanical tunnels.

Pancorneal Contact Lens with a Toric Edge: A New Concept in Keratoconus

2011 ◽  
Vol 21 (6) ◽  
pp. 685-690 ◽  
Author(s):  
Sizar Kamar ◽  
Charles Vervaet ◽  
Gregohus P.M. Luyten ◽  
Martine J. Jager
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Marked Improvement ◽  
Corneal Topography ◽  
Corrected Visual Acuity ◽  
The Mean ◽  
Best Corrected Visual Acuity

Purpose. To investigate whether fitting a patient with keratoconus to a pancorneal toric rigid gas-permeable (RGP) contact lens leads to a change in corneal compression and improves the best-corrected visual acuity (BCVA) and keratometry values. Methods. Thirty eyes with keratoconus were fitted with a newly designed pancorneal toric RGP contact lens. Each patient was examined at the time of enrollment and after having used the new contact lens for at least 2 months. Corneal topography was performed both times. Results. A change in corneal compression was noticed in 23 eyes (77%). Following the use of the pancorneal toric RGP contact lens, the average BCVA improved significantly (p=0.007), with a mean BCVA of 0.63 (SD 0.15) before and 0.70 (SD 0.18) after using the toric contact lens. No significant changes were seen in the mean vertical and horizontal K-values or the mean E-values. Conclusions. While no significant measurable differences in K- and E-values were observed, fitting of a pancorneal toric RGP contact lens in keratoconus led to a marked improvement in visual acuity and a visible change in corneal compression.

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