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Scleral lens

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https://www.readbyqxmd.com/read/28092274/power-profiles-and-in-vitro-optical-quality-of-scleral-contact-lenses-effect-of-the-aperture-and-power
#1
Alberto Domínguez-Vicent, Jose Juan Esteve-Taboada, Alberto Recchioni
OBJECTIVE: To assess the power profile and in vitro optical quality of scleral contact lenses with different powers as a function of the optical aperture. METHODS: The mini and semiscleral contact lenses (Procornea) were measured for five powers per design. The NIMO TR-1504 (Lambda-X) was used to assess the power profile and Zernike coefficients of each contact lens. Ten measurements per lens were taken at 3- and 6-mm apertures. Furthermore, the optical quality of each lens was described in Zernike coefficients, modulation transfer function, and point spread function (PSF)...
January 13, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28088605/comparison-of-the-anterior-chamber-angle-structure-between-children-and-adults
#2
Yukiko Shimizu, Shunsuke Nakakura, Toshihiko Nagasawa, Akiko Okamoto, Hitoshi Tabuchi, Yoshiaki Kiuchi
PURPOSE: To investigate the anterior chamber structure in children and adults with a similar axial length (AL). METHODS: A total of 50 children (mean age, 7.1 ± 3.3 years; range, 3-16) with mainly refractive error and 50 adults (mean age, 73.7 ± 7.8 years; range, 50-85) with short AL were included. The mean AL was 22.21 ± 0.88 mm (range, 20.67-23.97 mm) in children; 22.34 ± 0.53 mm (range, 20.50-22.96 mm), in adults. The corneal curvature, spherical equivalent, AL, central corneal thickness (CCT), inter-scleral spur distance, perpendicular distance, anterior chamber depth (ACD), angle opening distance (AOD), and lens vault were measured...
January 11, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
https://www.readbyqxmd.com/read/28086913/correction-of-irregular-and-induced-regular-corneal-astigmatism-with-toric-iol-after-posterior-segment-surgery-a-case-series
#3
Bence L Kolozsvári, Gergely Losonczy, Dorottya Pásztor, Mariann Fodor
BACKGROUND: Toric intraocular lens (IOL) implantation can be an effective method for correcting corneal astigmatism in patients with vitreoretinal diseases and cataract. Our purpose is to report the outcome of toric IOL implantation in two cases - a patient with scleral-buckle-induced regular corneal astigmatism and a patient with keratoconus following pars plana vitrectomy. As far as we are aware, there are no reported cases of toric IOL implantation in a vitrectomized eye with keratoconus nor of toric IOL implantation in patients with scleral-buckle-induced regular corneal astigmatism...
January 13, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28073689/corneo-scleral-contact-lens-in-a-piggyback-system-for-keratoconus-a-case-report
#4
Esteban Porcar, Juan Carlos Montalt, Enrique España-Gregori, Cristina Peris-Martínez
PURPOSE: We describe a case of fitting a corneo-scleral contact lens with a multi-aspheric geometry design (MAGD CScL) on top of a daily silicone hydrogel lens (piggyback system) for keratoconus management. METHODS: A 48-year-old man using soft toric contact lenses required an improvement in the unsatisfactory quality of his vision. He presented with bilateral asymmetric keratoconus with high myopia in the right eye (RE) and severe myopia in the left eye (LE). In addition, he had low vision in his LE because of a maculopathy...
January 7, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28050328/cataract-surgery-after-retinal-detachment-surgery-with-arruga-s-sutures-case-report
#5
Erkan Ünsal, Kadir Eltutar, Osman Kızılay, Belma Karini
A 56-year old female patient presented to our clinic with a complaint of low vision in her right eye. Twenty-two years earlier she had undergone a scleral buckling operation in her right eye because of retinal detachment. She indicated that vision in her right eye was good after the surgery but had recently been gradually declining. Best-corrected vision acuity was counting fingers at 1 meter in the right eye and 8/10 in the left eye. Anterior segment examination revealed stage 3 nuclear cataract in the right eye...
December 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28027273/oxygen-tension-beneath-scleral-lenses-of-different-clearances
#6
Claude J Giasson, Jeanne Morency, Marc Melillo, Langis Michaud
PURPOSE: To evaluate the relative partial pressure in oxygen (pO2) at the corneal surface under Boston XO2 scleral lenses (SL) fitted with targeted clearances of 200 and 400 μm (SL200 and SL400). METHODS: During this prospective study, the right eyes of eight normal subjects were fitted with SL200 and SL400. Clearance, validated after 5 minutes of wear with an optical coherence tomograph, was used with lens thicknesses to calculate transmissibility and estimate pO2...
December 23, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28002191/sekundo-s-applanator-5-years-of-experience-with-transconjunctival-suturing
#7
Hisham Elbaz, Walter Sekundo, Frank-Michael Schröder, Stephan Schulze
Sekundo's Applanator is a new surgical instrument used mainly in transconjunctival scleral flap suturing in cases of postoperative hypotony after trabeculectomy. In contrast to Hoskins lens, it offers better visualization of the border of the scleral flap with good intraoperative stabilization of the globe; thus, it increases the effectiveness and decreases the time of the surgical procedure. Sekundo's Applanator was also found to be useful in reducing the size of an oversized bleb after trabeculectomy and in the closure of leaking sutureless sclerotomies after vitrectomies...
December 20, 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27993459/corneal-epithelial-bullae-after-short-term-wear-of-small-diameter-scleral-lenses
#8
Alex D Nixon, Joseph T Barr, Dean A VanNasdale
Complications of scleral lens wear are not well documented or understood. While multiple studies focus on oxygen transmission during scleral lens wear and associated corneal swelling, little is known about the effects of varying scleral lens fitting relationships, especially when there is corneal interaction. Scleral lenses, by convention, are designed to completely clear the corneal surface and rest on the conjunctival and scleral tissue. However, some designs maximize oxygen transmission by reducing the lens diameter, thickness, and recommended corneal clearance...
December 16, 2016: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/27990363/comparison-of-iris-fixated-foldable-lens-and-scleral-fixated-foldable-lens-implantation-in-eyes-with-insufficient-capsular-support
#9
Han Zhang, Jun Zhao, Li-Jun Zhang, Jing Liu, Yuan Liu, Wei Song, Qing-Fen Tian, Qi Wang, David-Rex Hamilton
AIM: To compare the outcomes of vision using two different intraocular lens (IOL) replacement techniques, iris-fixated foldable intraocular lens (IF-IOL) and scleral-fixated foldable intraocular lens (SF-IOL) in patients with insufficient capsular support. METHODS: Total 63 eyes (62 patients) with insufficient posterior capsule support underwent replacement of IF-IOL or SF-IOL between January 2008 and August 2011. Outcome measures included changes in visual acuity, slit lamp examination, refractive indices and corneal curvatures...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27984546/scleral-suture-fixation-technique-for-one-piece-acrylic-intraocular-lens
#10
Ella H Leung, Amir Mohsenin, William E Smiddy
PURPOSE: To apply a previously published scleral fixation technique to secure one-piece acrylic intraocular lenses (IOLs) to the sclera. METHODS: Retrospective, consecutive, noncomparative case series. RESULTS: All patients (16 eyes of 15 patients) who underwent scleral fixation of 1-piece acrylic IOLs using the loop method from 2014 to 2016 were included. The mean follow-up was 8.1 months. Repositioning of dislocated 1-piece acrylic IOLs was performed in 8 eyes, a primary implantation in 5 eyes, and IOL exchange in 3 eyes...
December 14, 2016: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/27984063/off-axis-astigmatism-in-the-isolated-chicken-crystalline-lens
#11
Felix Maier, Siegfried Wahl, Frank Schaeffel
The chicken eye was previously found to have little off-axis astigmatism which is not explained by its special corneal shape but rather by the optical properties of the crystalline lens. To learn more about lens design, we studied off-axis astigmatism in the chicken lens in situ and compared it to a glass lens of similar power but with homogenous refractive index. After euthanasia, enucleated eye balls were cut in the equatorial plane right behind the scleral ossicles. The anterior segment was placed in a water-filled chamber...
October 28, 2016: Vision Research
https://www.readbyqxmd.com/read/27958214/the-correct-shake-for-handshake-in-glued-intrascleral-fixation-of-intraocular-lens
#12
Priya Narang, Amar Agarwal
We hereby describe the correct method to perform a "handshake technique" and easy transfer of haptics from one hand to another for glued intrascleral fixation of an intraocular lens (glued IOL). The procedure was implemented in 57 cases that necessitated the application of performing a glued IOL procedure and it resulted in an appropriate and easy externalization of haptic in all the cases. The surgeons' positioning with reference to the scleral flap is an essential component and the surgeon should always be positioned perpendicular to the plane of scleral flaps and the plane of haptic maneuver...
November 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/27956281/retro-iris-suture-fixation-of-a-rigid-intraocular-lens
#13
Aravind Haripriya, Sankalp S Sharma
: We present an iris suture fixation technique for a rigid poly(methyl methacrylate) (PMMA) intraocular lens (IOL). A 10-0 polypropylene suture on a long curved needle is used to preplace 2 iris suture bites 180 degrees apart. The suture loops below the iris are retracted through the main scleral tunnel using a Kuglen hook and a McPherson forceps. The 2 suture loops are twirled twice around the corresponding haptics of a standard 3-piece PMMA IOL, and the IOL is placed in the sulcus. After it is confirmed that the loop surrounds the haptic, the suture knot is tied to secure the IOL to the iris...
November 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27941047/cataract-surgery-in-children-with-retinopathy-of-prematurity-rop-surgical-outcomes
#14
Chinyelu Nkemdilim Ezisi, Ramesh Kekunnaya, Subhadra Jalali, Divya Balakrishnan, Padmaja Kumari Rani, Ashik Mohamed, Preeti Patil Chhablani
PURPOSE: To report the outcomes of cataract surgery in children with retinopathy of prematurity (ROP). METHODS: A retrospective case review of all children diagnosed with ROP from January 2001 to December 2014 was done and those who underwent cataract surgery were included in the study. Details of ROP and cataract treatment, postoperative complications and outcomes were analysed. RESULTS: Of the 2258 children diagnosed to have ROP, 28 eyes of 22 children were included, 14 boys and 8 girls...
December 9, 2016: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/27935601/incidence-and-risk-factors-for-cystoid-macular-edema-following-scleral-buckling
#15
T-T Lai, J-S Huang, P-T Yeh
PurposeTo investigate the incidence of cystoid macular edema (CME) after scleral buckling (SB) and verify the possible risk factors of CME.MethodsA retrospective, non-comparative, interventional case series study was conducted. Clinical charts of 130 consecutive patients who were underwent successful SB for primary retinal detachment (RD) from 2009 to 2013 were reviewed. Optical coherence tomography (OCT) was applied to detect CME. Data pertaining to patient demographics, pre- and postoperative visual acuity, surgical procedures, and postoperative OCT findings were recorded...
December 9, 2016: Eye
https://www.readbyqxmd.com/read/27923771/off-axis-astigmatism-in-the-isolated-chicken-crystalline-lens
#16
Felix Maier, Siegfried Wahl, Frank Schaeffel
The chicken eye was previously found to have little off-axis astigmatism which is not explained by its special corneal shape but rather by the optical properties of the crystalline lens. To learn more about lens design, we studied off-axis astigmatism in the chicken lens in situ and compared it to a glass lens of similar power but with homogenous refractive index. After euthanasia, enucleated eye balls were cut in the equatorial plane right behind the scleral ossicles. The anterior segment was placed in a water-filled chamber...
December 2016: Vision Research
https://www.readbyqxmd.com/read/27914839/late-in-the-bag-intraocular-lens-dislocation-a-randomized-clinical-trial-comparing-lens-repositioning-and-lens-exchange
#17
Olav Kristianslund, Marianne Råen, Atle E Østern, Liv Drolsum
PURPOSE: To compare the efficacy and safety of 2 operation methods for late in-the-bag intraocular lens (IOL) dislocation. DESIGN: Prospective, randomized, parallel-group surgical trial. PARTICIPANTS: Patients referred to Oslo University Hospital (tertiary referral center). METHODS: We randomly assigned 104 patients (104 eyes) either to IOL repositioning by scleral suturing (n = 54) or to IOL exchange with retropupillary fixation of an iris-claw IOL (n = 50)...
November 30, 2016: Ophthalmology
https://www.readbyqxmd.com/read/27893097/benefit-of-measuring-anterior-segment-structures-using-an-increased-number-of-optical-coherence-tomography-images-the-chinese-american-eye-study
#18
Benjamin Y Xu, Paul Israelsen, Billy X Pan, Dandan Wang, Xuejuan Jiang, Rohit Varma
Purpose: The purpose of this study was to evaluate the benefit of analyzing an increased number of anterior segment optical coherence tomography (AS-OCT) images on measurement values of various anterior segment parameters. Methods: Subjects for this cross-sectional study were recruited from the Chinese American Eye Study (CHES), a population-based study in Los Angeles, CA. Thirty-two AS-OCT images were acquired from one eye each of 83 consecutive subjects. Sixteen parameters were analyzed in each image, including angle opening distance (AOD), angle recess area (ARA), trabecular iris space area (TISA), trabecular iris angle (TIA), scleral spur angle (SSAngle), lens vault (LV), pupillary diameter (PD), anterior chamber depth (ACD), anterior chamber width (ACW), iris area (IA), and anterior chamber area (ACA)...
November 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27882245/ocular-biocompatibility-of-poly-n-isopropylacrylamide-pnipam
#19
Luiz H Lima, Yael Morales, Thiago Cabral
Purpose. To study the safety of intravitreal injections of poly-N-isopropylacrylamide (pNIPAM) tissue adhesive in rabbit eyes. Methods. Twelve study rabbits received an intravitreal injection of 0.1 mL 50% pNIPAM in the right eye. Follow-up examinations included color fundus photography, fundus fluorescein angiography (FA), optical coherence tomography (OCT), and electroretinography (ERG). Subsequent to the last follow-up assessment, the rabbits were sacrificed and histopathological study on the scleral incision sites was performed...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27881591/vernal-keratoconjunctivitis-culmination-of-management-using-immunosuppression-surgical-and-prosthetic-therapy-over-quarter-century
#20
Shilpa Das, Anand S Pasari, Virender S Sangwan
A 22-year-old male patient presented in 1988 with active vernal keratoconjunctivitis. He was treated with topical mast cell stabilisers and corticosteroids. Chronic inflammation despite topical treatment necessitated oral immunosuppressants. Active disease came under control with this; however, the patient gradually developed limbal stem cell deficiency. He underwent bilateral pannus resection with amniotic membrane transplantation that resulted in improved ocular surface. In 2007, patient was found to have significant bilateral posterior subcapsular cataracts and underwent bilateral cataract surgery with intraocular lens implantation with good visual outcome...
November 23, 2016: BMJ Case Reports
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