Publications by authors named "Harkaran Bains"
Purpose: To use spectral-domain optical coherence tomography (SD-OCT) data to develop a new implantable collamer lens (ICL) sizing formula and compare vault outcomes with the Online Calculation and Ordering System™ (OCOS) and the NK2 formula.
Methods: Consecutive eyes (n = 237) were evaluated that had undergone ICL/toric ICL implantation. Actual ICL vaults were measured, and a what-if analysis was performed to predict vault values with the NK2 formula using SD-OCT data.
Purpose: To evaluate the efficacy and safety of transepithelial accelerated crosslinking (TE-ACXL) using pulsed light and supplemental oxygen.
Methods: Thirty eyes of 30 consecutive patients with progressive keratoconus or post-LASIK ectasia were enrolled in a prospective non-comparative study conducted at the Magrabi Eye Center (Jeddah, Saudi Arabia). All eyes underwent TE-ACXL with supplemental oxygen.
Purpose: To evaluate the visual and refractive outcomes, visual quality, patient satisfaction, and spectacle independence after phacoemulsification with bilateral implantation of a diffractive trifocal intraocular lens (IOL).
Methods: The study sample comprised 36 consecutive patients (72 eyes). Twenty-three (64%) patients underwent refractive lens exchange and 13 (36%) underwent cataract surgery.
Purpose: To compare the refractive, visual acuity, topographic, and spherical aberration outcomes of LASIK using the Quest excimer laser platform with the optimized prolate ablation (OPA) profile (NIDEK Co Ltd) in one eye and conventional ablation profile in the fellow eye of the same patient.
Methods: Thirty-seven myopic patients underwent LASIK bilaterally, with one eye randomized to receive OPA ablation (-3.88±1.
Purpose: To compare the postoperative outcomes of aspheric or prolate LASIK for myopia and myopic astigmatism.
Methods: In this double-blind, bilateral, randomized trial, 40 patients (80 eyes) with -0.75 to -7.
Purpose: To compare refractive outcomes, higher-order aberrations (HOAs), and contrast sensitivity of myopic wavefront-guided aspheric laser in situ keratomileusis centered on the coaxially sighted corneal light reflex or on the line of sight.
Setting: Okamoto Eye Clinic, Ehime, Japan.
Design: Comparative case series.
Purpose: To assess the compensation of total ocular and corneal wavefront aberrations after conventional myopic LASIK.
Methods: This study comprised 57 eyes of 57 patients. Total and corneal aberrations were measured preoperatively and 3 months postoperatively using the OPD-Scan (NIDEK Co Ltd) aberrometer.
Purpose: To describe the treatment of highly aberrated eyes due to previous excimer laser surgery or trauma.
Methods: Three eyes (three patients) with reduced visual quality due to previous decentration or corneal laceration (one eye) underwent topography-guided ablation using the CXIII excimer laser (NIDEK Co Ltd) to correct residual refractive error and/or wavefront aberrations.
Results: Postoperatively, one patient had a one-line increase in corrected distance visual acuity (CDVA) with a reduction in visual symptoms.
Purpose: To measure and compare total, corneal, and internal ocular aberrations using combined wavefront analysis and corneal topography in eyes with keratoconus and eyes with normal corneas.
Methods: This prospective study comprised eyes of patients with keratoconus and myopic patients seeking refractive surgery. Patients diagnosed with keratoconus and with a classification of "normal" or "keratoconus" on the NIDEK Corneal Navigator corneal disease screening software were selected for inclusion in this study.
Purpose: To compare refractive outcomes of myopic LASIK with centration on the coaxially sighted corneal light reflex (CSCLR) to centration on the center of the pupil (line of sight [LOS]).
Methods: The NIDEK CXIII excimer laser was used to treat 268 eyes with centration on the CSCLR (CSCLR group) and 288 eyes with centration on the LOS (LOS group). For the CSCLR group, the laser ablation was delivered 80% closer to the visual axis.
Purpose: To describe the retreatment of highly aberrated corneas due to previous keratorefractive surgery using topography-guided aspheric treatments.
Methods: Eight eyes (five patients) with reduced mesopic visual quality due to previous keratomileusis, excimer laser surgery, or radial keratotomy underwent retreatment with the customized aspheric treatment zone (CATz) algorithm with the CXIII excimer laser (NIDEK Co Ltd) to correct corneal wavefront aberrations. Before CATz treatments, all patients were satisfied with their preoperative photopic vision (all 20/30 or better uncorrected) yet were dissatisfied with their vision at night.
Purpose: To report refractive outcomes of hyperopic LASIK with automated centration on the visual axis compared with centration on the line of sight (LOS).
Methods: The NIDEK Advanced Vision Excimer Laser platform (NAVEX) was used to treat 181 hyperopic eyes with centration on the LOS (LOS group) and 64 hyperopic eyes with centration on the visual axis (visual axis group). The coordinates of the visual axis were digitally transferred to the excimer laser system based on the positional relationship between the LOS and the coaxially sighted corneal light reflex.
Purpose: To report the outcomes of topography-guided photorefractive keratectomy (PRK) for the treatment of myopia with or without astigmatism using the customized aspheric transition zone (CATz) ablation algorithm.
Methods: In this study, 335 eyes underwent PRK using the NIDEK Advanced Vision Excimer laser platform (NAVEX). Mean preoperative manifest refraction spherical equivalent was -4.
Unlabelled: POSE: To compare visual, refractive, and safety outcomes among a non-wavefront scanning-slit laser (NIDEK EC-5000) and wavefront-driven lasers (Alcon CustomCornea and VISX CustomVue).
Methods: A retrospective comparison of outcomes for 290 eyes that underwent LASIK for myopia and myopic astigmatism with either a conventional or custom ablation excimer laser system were compared. The preoperative refractive error and age of the patients were matched.
Purpose: To assess the efficacy, predictability, safety, and quality-of-life effects of topography-guided laser in situ keratomileusis (LASIK) for the correction of myopia with astigmatism using the EC-5000 CXII excimer laser equipped with a customized aspheric treatment zone algorithm.
Setting: Ophthalmology clinics in the United States and Mexico.
Methods: In a multicenter United States Food and Drug Administration study of topography-guided LASIK, 4 centers enrolled 135 eyes with a spherical manifest refraction error ranging from -0.
Purpose: To assess the efficacy, predictability, and safety of topography-guided laser in situ keratomileusis (LASIK) for the surgical correction of low to moderate myopia with astigmatism using the Nidek CXIII excimer laser equipped with the customized aspheric treatment zone (CATz) algorithm.
Methods: In a multicenter US Food and Drug Administration study of topography-guided LASIK, 4 centers enrolled 135 eyes with manifest refraction sphere that ranged from -0.50 to -7.
Purpose: To investigate the predictability and accuracy of active cyclotorsion compensation during LASIK for myopia with astigmatism.
Methods: Fifty-two eyes of 26 patients were divided into two groups; one group (30 eyes) underwent primary LASIK with torsion error correction (TEC [TEC group]) and 22 eyes underwent LASIK without TEC (control group). The NIDEK EC-5000 CX III excimer laser was used for all treatments.
Purpose: To investigate the efficacy of mitomycin C (MMC) in preventing haze formation in surface wavefront customized ablations with successful refractive treatment (laser epithelial keratomileusis [LASEK]) and to evaluate the safety of this technique on corneal stroma and endothelium.
Methods: This study was a prospective, double-masked, randomized clinical trial involving 52 eyes (30 placebo and 22 MMC) of 26 patients. The manifest refractive spherical equivalent (MRSE), best spectacle-corrected visual acuity, uncorrected visual acuity, corneal pachymetry, topography, aberrometry, endothelial specular microscopy, contrast sensitivity, corneal confocal microscopy, and complaints of pain via a subjective questionnaire were recorded preoperatively and 90 days postoperatively.
Purpose: To compare the distribution of ocular higher order wavefront aberrations (third to sixth order) in the Brazilian population of Asian and non-Asian refractive surgery patients.
Methods: Preoperative refractive and wavefront data were reviewed for 648 eyes in 324 patients who underwent custom ablation at the Excimer Laser Santa Cruz refractive surgery center in São Paulo, Brazil, from March 2002 to July 2005. Patients were divided into two groups: Asian patients and non-Asian patients, based on family history.
Purpose: To compare refractive outcomes, wavefront outcomes, and corneal asphericity indices (Q values) for patients treated with wavefront-guided or topography-guided custom ablations using the NIDEK Advanced Vision Excimer Laser System (NAVEX).
Methods: A total of 196 eyes of 98 patients underwent wavefront-guided or topography-guided LASIK. A contralateral study of 28 eyes of 14 patients who underwent customized aspheric treatment zone (CATz) ablation in one eye and optical path difference customized aspheric treatment (OPDCAT) in the fellow eye comprised one part of the study.
Purpose: To determine whether five changes to our hyperopic LASIK protocol produced better outcomes.
Methods: Five changes, both technical and surgical, were instituted for the treatment of hyperopia. These five changes were nomogram refinements accounting for accommodation, use of a 7.
Optimized prolate corneal ablation: case report of the first treated eye.
J Refract Surg
November 2005
Purpose: To present the first patient treated with an optimized prolate ablation algorithm (OPA) with the NIDEK Advanced Vision Excimer laser platform (NAVEX; NIDEK, Gamagori, Japan).
Methods: A patient with moderate myopia and large scotopic pupils received contralateral LASIK treatment, treating one eye with OPA and the other with conventional treatment.
Results: At 3 months postoperatively, corneal topography and wavefront analysis show a prolate result with the OPA treatment and an oblate result with the conventional treatment.
Purpose: To describe a novel excimer laser ablation algorithm, termed optimized prolate ablation (OPA), that uses both topography and ocular aberrometry and maintains or improves the natural corneal shape postoperatively.
Methods: A descriptive article outlining the theory behind this OPA algorithm.
Results: The theoretical changes to the ablation algorithm described in this article will produce a prolate cornea postoperatively.
The NIDEK Advanced Vision Excimer Laser (NAVEX) platform has been used to treat primary eyes and in a wide variety of therapeutic applications. Use of an extremely robust scanning slit skiascopy aberrometer has enabled the treatment of eyes in the latter category. Primary outcomes using NAVEX have shown a reduced induction of higher order aberrations, a maintenance or gain of contrast sensitivity in most patients, and excellent refractive outcomes.
View Article and Find Full Text PDFPurpose: To determine by wavefront analysis the difference between eyes considered normal, eyes diagnosed with keratoconus, and eyes that have undergone penetrating keratoplasty
Methods: The Nidek OPD-Scan wavefront aberrometer was used to measure ocular aberrations out to the sixth Zernike order. One hundred and thirty eyes that were free of ocular pathology, 41 eyes diagnosed with keratoconus, and 8 eyes that had undergone penetrating keratoplasty were compared for differences in root mean square value. Three and five millimeter root mean square values of the refractive power aberrometry maps of the three classes of eyes were compared.