scholarly journals Changes in functional, anatomical and optical parameters of the eye in children with habitually excessive accommodation stress and pseudomyopia after regular badminton playing

2019 ◽  
Vol 12 (4) ◽  
pp. 51-63
Author(s):  
E. P. Tarutta ◽  
N. A. Tarasova ◽  
G. A. Markosian ◽  
S. V. Milash ◽  
S. G. Harutyunyan ◽  
...  
Keyword(s):  
Blood Flow ◽  
Visual Acuity ◽  
Choroidal Thickness ◽  
Ophthalmic Artery ◽  
Spherical Aberration ◽  
Blood Flow Rate ◽  
Optical Parameters ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
Retinal Artery

Purpose. To study the state of refraction, accommodation, and blood flow in eye vessels of children with habitually excessive accommodation stress (HEAS) and pseudomyopia practicing badminton.Material and methods. The study involved 11 patients (20 eyes) aged 7 to 11 years (average M±SD: 9.24 ± 1.06 years) with pseudomyopia and HEAS: 4 patients with myopia (7 eyes), 3 children with hyperopia (6 eyes), 4 children with emmetropia (7 eyes) before they started practicing badminton and after playing it for a certain time. All patients were tested for visual acuity, subjective and objective accommodation, optical biometry, aberrometry, velocity of blood flow in eye vessels, and choroidal thickness.Results. After 1 year of regular badminton workout, the subjects revealed a 0.92 ± 0.82 D weakening of manifest refraction, a decrease in accommodation tone by 0.85 ± 0.77 D, an increase in blood flow rate in ophthalmic artery and the central retinal artery, an increase in positive spherical aberration, a decrease in aberrations associated with mismatch and irregularity ofoptical system elements (tilt, trefoil, coma), which indirectly indicates a strengthening of the ligamentous apparatus of the lens.Conclusion. Practicing sports (badminton) contributes to the elimination of pseudomyopia, improvement of uncorrected visual acuity, accommodative ability, and ophthalmic hemodynamics indicators.

scholarly journals Corneal Cross-linking in Patients Younger than 18 Years: Long-term Follow-up in Three Israeli Medical Centers

2014 ◽  
Vol 3 (2) ◽  
pp. 84-87
Author(s):  
David Zadok ◽  
Isaac Avni ◽  
Erez Bakshi ◽  
Irina S Barequet ◽  
Isaac Aizenman ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Pediatric Population ◽  
Cross Linking ◽  
Safe Procedure ◽  
Medical Centers ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
Long Term Follow Up

ABSTRACT Purpose To report refractive, topographic and safety outcomes of corneal cross-linking (CXL) in patients younger than 18 years of age with progressive keratoconus. Materials and methods In this retrospective study, we enrolled 31 eyes of 21 children aged 11 to 17 years that underwent corneal riboflavin-ultraviolet A induced CXL due to progressive keratoconus at three different ophthalmology departments in Israel. They were followed for 3 to 48 months (average 23 ± 13.6 months). Evaluated parameters were uncorrected visual acuity (UCVA), best spectacle corrected visual acuity (BSCVA), manifest refraction, pachymetry, slit- lamp examination and corneal topography at baseline and at 1,3,6,12,24 and 48 months. Results We found a nonsignificant improvement in UCVA and BSCVA with a small reduction of manifest cylinder and no significant change in spherical equivalent or K-values. Following CXL, stability of UCVA and BSCVA at the last follow-up examination was found in 71 and 77% of treated eyes, respectively. No permanent adverse events have been recorded throughout the study period. Conclusion In our series, CXL was a safe procedure in the pediatric population. Stabilization of progressive keratoconus was achieved in visual acuity, refractive and topography parameters with no improvement in corneal indices in contrary to adult CXL treatment. How to cite this article Bakshi E, Barequet IS, Aizenman I, Levinger S, Avni I, Zadok D. Corneal Corss-linking in Patients Younger than 18 Years: Long-term Follow-up in Three Israeli Medical Centers. Int J Kerat Ect Cor Dis 2014;3(2):84-87.

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 Ocular wavefront aberrations in acute central serous chorioretinopathy

2021 ◽  
Vol 9 (1) ◽  
pp. 33-33
Author(s):  
Banafsheh Kharrazi Ghadim ◽  
Nazli Taheri ◽  
Mohammad Reza Niyousha
Keyword(s):  
Visual Acuity ◽  
Root Mean Square ◽  
Central Serous Chorioretinopathy ◽  
Spherical Aberration ◽  
Optical Parameters ◽  
Average Height ◽  
Mean Square ◽  
Pupillary Dilation ◽  
Foveal Thickness ◽  
Wavefront Aberrations

Background: Central serous chorioretinopathy (CSCR) is a condition of choroidal and retinal pathologies that may affect vision, so we assessed vision by the ocular wavefront in the acute form of CSCR. Methods: This cross-sectional study included 21 cases (16-male, 5-female) of acute onset CSCR was referred to the retina clinic of Nikookari Eye Hospital. Visual acuity and ocular examination with and without pupillary dilation record. Central macular thickness and sub-foveal fluid height of all patients measured by spectral-domain optical coherence tomography (SD-OCT). All of them fulfilled binocular visual function analyzer by Tracy Technology after complete pupillary dilation. The items such as spherical equivalent, total root mean square, total lower-order aberration, total higher-order aberration, defocus, astigmatism, secondary astigmatism, coma, spherical aberration, trefoil, Strehl ratio in point spread function, the average height in the modulation transfer function, and root mean square error registered. Generalized Estimation Equations (GEE) were used to compare two groups of affected CSCR and normal contralateral eyes. Results: The mean uncorrected distance visual acuity in the CSCR eyes is (Decimal Notation) 0.82±0.17 and in the contralateral eyes is 0.95±0.09 (P=0.002). Analysis of macular OCT data CSCR group represents: central foveal thickness 485.9±165.12 μm and mean fluid height 284.3±165.42 μm. The mentioned optical parameters of ocular wavefront aberrations do not have significantly different results in the two groups. Conclusion: Our study showed CSCR reduced uncorrected visual acuity but it did not detect significant ocular wavefront changes in acute CSCR

scholarly journals High Order Aberration Outcomes of Corneal Collagen Crosslinking in Eyes with Keratoconus and Post-LASIK Ectasia

2014 ◽  
Vol 3 (3) ◽  
pp. 107-112
Author(s):  
Adam Muzychuk ◽  
Victor Penner ◽  
Guillermo Rocha
Keyword(s):  
Visual Acuity ◽  
Spherical Aberration ◽  
Retrospective Chart Review ◽  
High Order ◽  
Collagen Crosslinking ◽  
Distance Visual Acuity ◽  
High Order Aberration ◽  
Manifest Refraction ◽  
Corneal Collagen Crosslinking ◽  
Corneal Collagen

ABSTRACT Purpose To evaluate the effect of riboflavin and ultraviolet- A-induced corneal collagen crosslinking (CXL) on high order aberrations (HOA) up to third-order at 6 months using the iTrace wavefront aberrometer in patients with progressive keratoconus and post-LASIK ectasia. Materials and methods Ongoing retrospective chart review of patients having undergone CXL. The iTrace (Tracey Technologies, Houston, TX) was used to evaluate HOA. Patient data was collected from a single clinical site pre- and 6 months postoperatively. Data collected included logMAR uncorrected distance visual acuity (UDVA), logMAR corrected distance visual acuity (CDVA), manifest refraction, and HOA measurements. Data was analyzed with paired two-tailed student's t-test. Results 18 eyes (9M:4F, mean age 29.2 years, range 16-45) had 6 months of follow-up. Total HOAs, total coma and total trefoil were significantly reduced at 6 months by 16, 33 and 26% respectively (p < 0.05). Nonsignificant trends toward improvement were seen in spherical aberration, secondary astigmatism and UDVA. There were no statistically significant changes in manifest refraction or CDVA. Conclusion Improvement in high order aberration profile is one mechanism by which corneal collagen crosslinking enhances visual function in ectatic corneas. Total HOA and total coma measures are the most commonly reported improvements in HOA measures in previous studies, while total trefoil has only been observed in one other study. The improvements seen in HOAs remain fairly modest which likely accounts for the lack of measureable improvement in high-contrast visual acuity measures, such as Snellen UDVA and CDVA. This study is the first to report HOA outcomes with the iTrace wavefront aberrometer. How to cite this article Muzychuk A, Penner V, Rocha G. High Order Aberration Outcomes of Corneal Collagen Crosslinking in Eyes with Keratoconus and Post-LASIK Ectasia. Int J Kerat Ect Cor Dis 2014;3(3):107-112.

scholarly journals Corneal Cross-Linking for Progressive Keratoconus in Children: Our Experience

2012 ◽  
Vol 1 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Erez Bakshi ◽  
Yaniv Barkana ◽  
Yakov Goldich ◽  
Isaac Avni ◽  
David Zadok
Keyword(s):  
Visual Acuity ◽  
Medical Center ◽  
Statistical Significance ◽  
Cross Linking ◽  
Long Term Stability ◽  
Corrected Visual Acuity ◽  
Department Of Ophthalmology ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity

ABSTRACT Purpose To assess the effect of corneal cross-linking on progressive keratoconus in children. Method In this retrospective study we enrolled nine eyes of nine consecutive children aged 11 to 17 years old who underwent corneal riboflavin-UVA induced cross-linking for progressive keratoconus at the Department of Ophthalmology at Assaf Harofeh Medical Center. They were followed for 6 to 24 months (average 16 ± 8.1 months). Evaluated parameters were uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), manifest refraction, pachymetry, slit lamp examination and corneal topography. Results Cross-linking resulted in stability of visual acuity in seven of the nine (77.8%) treated eyes. We found a nonsignificant improvement in UCVA and BSCVA with a small reduction of manifest cylinder. Furthermore, there was an improvement in spherical equivalent that was close to statistical significance (p = 0.07). There was 0.86 D reduction of average Kmax value postoperatively (p = 0.36). Most patients (7 of 9, 77.8%) showed a long-term stability or reduction in Kmax. Conclusion In this study, we demonstrated the efficacy of corneal cross-linking in arresting the progression of keratoconus in children. We believe that larger scale studies in this age group should be performed to further establish the relevance of this technique in children. How to cite this article Bakshi E, Barkana Y, Goldich Y, Avni I, Zadok D. Corneal Cross-Linking for Progressive Keratoconus in Children Our Experience. Int J Keratoco Ectatic Corneal Dis 2012;1(1):53-56.

scholarly journals A Case of Incomplete Central Retinal Artery Occlusion Associated with Short Posterior Ciliary Artery Occlusion

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Shinji Makino ◽  
Mikiko Takezawa ◽  
Yukihiro Sato
Keyword(s):  
Visual Acuity ◽  
Optic Disc ◽  
Ophthalmic Artery ◽  
Central Retinal Artery Occlusion ◽  
Retinal Artery Occlusion ◽  
Artery Occlusion ◽  
Central Retinal Artery ◽  
Posterior Ciliary Artery ◽  
Retinal Artery ◽  
Ciliary Artery

To our knowledge, incomplete central retinal artery occlusion associated with short posterior ciliary artery occlusion is extremely rare. Herein, we describe a case of a 62-year-old man who was referred to our hospital with of transient blindness in his right eye. At initial examination, the patient’s best-corrected visual acuity was 18/20 in the right eye. Fundus examination showed multiple soft exudates around the optic disc and mild macular retinal edema in his right eye; however, a cherry red spot on the macula was not detected. Fluorescein angiography revealed delayed dye inflow into the nasal choroidal hemisphere that is supplied by the short posterior ciliary artery. The following day, the patient’s visual acuity improved to 20/20. Soft exudates around the optic disc increased during observation and gradually disappeared. His hemodynamic parameters revealed subclavian steal syndrome as examined by cervical ultrasonography and digital subtraction angiography. We speculate that his transient blindness was due to ophthalmic artery spasms. In this particular case, spasms of the ophthalmic artery and occlusion of the short posterior ciliary artery occurred simultaneously. As the short posterior ciliary artery branches from the ophthalmic artery, the anatomical location of the lesion might be near the branching of both arteries.

Use of new-generation hybrid contact lenses for managing challenging corneas

2020 ◽  
pp. 112067212094275
Author(s):  
Ibrahim Inan Harbiyeli ◽  
Elif Erdem ◽  
Puren Isik ◽  
Meltem Yagmur ◽  
Reha Ersoz
Keyword(s):  
Visual Acuity ◽  
Medical Records ◽  
Contact Lenses ◽  
Corrected Visual Acuity ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
The Mean ◽  
New Generation ◽  
Generation Hybrid ◽  
Irregular Astigmatism

Introduction: To evaluate the safety and efficacy of new-generation hybrid contact lenses (HCL) among patients with irregular astigmatism. Methods: Medical records of 25 patients fit with new-generation HCL (Eyebrid® and AirFlex®) were retrospectively reviewed. The data collected included etiology of irregular astigmatism, uncorrected visual acuity, manifest refraction, spectacle-corrected visual acuity (S-CDVA), steep / flat keratometric values, corneal astigmatism, records of rigid / soft CL fitted before HCL, all parameters of the trial lenses, and the final prescribed HCL parameters and HCL-CDVA. Results: The study included 34 eyes from 25 patients (nine females and 16 males) with an average age of 29 ± 13 (ranging from 8–56) years. In total, 25 eyes with keratoconus, four with post - keratoplasty astigmatism, three with irregular astigmatism due to corneal trauma and two with residual astigmatism after radial keratotomy were fit with HCL. The mean S-CDVA (logMAR) improved significantly from 0.76 ± 0.41 to 0.14 ± 0.15 with HCL ( p < 0.01). The most common indication for HCL was inability to fit with rigid gas permeable (RGP) lenses (22 eyes). The average number of lenses to successful fit was 1.4 (mode, 1; median, 1) and ideal fit was achieved with the first trial lens in 25 eyes (73%). Seven patients (nine eyes, 36%) discontinued lens use within the first 6 months because of discomfort (six eyes, 24%), ocular allergy (two eyes, 8%) and tearing of contact lens (one eye, 4%). Discussion: New-generation HCL may be a suitable option for fitting challenging corneas with irregular astigmatism that cannot be rehabilitated efficiently with rigid lenses.

scholarly journals Long-Term Outcomes of Radial Keratotomy, Laser In Situ Keratomileusis, and Astigmatic Keratotomy Performed Consecutively over a Period of 21 Years

2015 ◽  
Vol 2015 ◽  
pp. 1-4
Author(s):  
Priyanka Chhadva ◽  
Florence Cabot ◽  
Anat Galor ◽  
Sonia H. Yoo
Keyword(s):  
Visual Acuity ◽  
Laser In Situ Keratomileusis ◽  
Radial Keratotomy ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
Initial Improvement ◽  
Astigmatic Keratotomy ◽  
The Right

Purpose. To describe a case of 3 refractive procedures performed in one eye over 2 decades.Methods. Case report.Results. A 41-year-old patient presented for refractive surgery evaluation. His ocular history includes bilateral radial keratotomy performed 21 years ago for moderate myopia: spherical equivalence of −4.25 D bilaterally. Postoperative uncorrected visual acuity (UCVA) was 20/30; however, over time he developed a hyperopic shift and UCVA decreased to 20/40 in the right eye. Thus, laser-assisted in situ keratomileusis (LASIK) was performed at an outside institution 6.5 years later, and the patient had initial improvement of UCVA to 20/25. Due to a change in refractive error, the patient underwent uneventful astigmatic keratotomy 13 years after LASIK in the right eye, and 1.5 years after surgery best-corrected visual acuity was 20/25 with manifest refraction of −1.00+5.50×134°.  Conclusion. We report the outcomes and natural refractive progression in a patient who underwent three corneal refractive procedures over two decades. This case underlines the difficulties of long-term management of post-RK hyperopia and astigmatism.

scholarly journals Associating the biomarkers of ocular blood flow with lamina cribrosa parameters in normotensive glaucoma suspects. Comparison to glaucoma patients and healthy controls

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248851
Author(s):  
Patrycja Krzyżanowska-Berkowska ◽  
Karolina Czajor ◽  
D. Robert Iskander
Keyword(s):  
Blood Flow ◽  
Ophthalmic Artery ◽  
Lamina Cribrosa ◽  
Ocular Blood Flow ◽  
Central Retinal Artery ◽  
Healthy Controls ◽  
Mean Flow ◽  
Posterior Ciliary Artery ◽  
Retinal Artery ◽  
Ciliary Artery

Purpose To evaluate association between ocular blood flow biomarkers and lamina cribrosa parameters in normotensive glaucoma suspects compared to glaucoma patients and healthy controls. Methods A total of 211 subjects (72 normotensive glaucoma suspects, 70 with primary open-angle glaucoma and 69 controls) were included. Ocular blood flow biomarkers in ophthalmic artery, central retinal artery, as well as in nasal and temporal short posterior ciliary arteries were measured using colour Doppler imaging. Lamina cribrosa position was assessed by measuring its depth, deflection depth, lamina cribrosa shape index and its horizontal equivalent (LCSIH) on B-scan images obtained using optical coherence tomography. Results Ocular blood flow biomarkers in glaucoma patients were statistically significantly reduced when compared to healthy controls in peak systolic velocity (PSV) (P = 0.001 in ophthalmic artery and P<0.001 in central retinal artery) and mean flow velocity (Vm) (P = 0.008 in ophthalmic artery and P = 0.008 in central retinal artery), but not statistically significantly different to that of glaucoma suspects except for PSV in central retinal artery (P = 0.011). Statistically significant correlations corrected for age, central corneal thickness and intraocular pressure were found in glaucoma patients between LCSIH and end diastolic velocity of central retinal artery (P = 0.011), and of nasal short posterior ciliary artery (P = 0.028), and between LCSIH and Vm of central retinal artery (P = 0.011) and of nasal short posterior ciliary artery (P = 0.007). No significant correlations were observed between these parameters in glaucoma suspects and healthy controls. Conclusions Impaired ocular blood flow associated with the deformation of lamina cribrosa was found in glaucoma patients, whereas glaucoma suspects had similar lamina cribrosa shape to glaucoma patients but that deformation was not associated with ocular blood flow biomarkers.

scholarly journals Unilateral Post-LASIK Ectasia in a Topographical Normal Eye with a Slight Asymmetry in the Contralateral Eye

2014 ◽  
Vol 3 (1) ◽  
pp. 47-51
Author(s):  
Marouen Berguiga ◽  
Alain Saad
Keyword(s):  
Visual Acuity ◽  
Refractive Surgery ◽  
Anterior Segment ◽  
Manifest Refraction ◽  
Uncorrected Visual Acuity ◽  
History Of ◽  
Orbscan Ii ◽  
Contralateral Eye ◽  
The Right ◽  
Radial Axis

ABSTRACT Purpose To report a case of post-LASIK unilateral corneal ectasia. Setting Department of anterior segment and Refractive surgery, Rothschild Foundation, Paris. Case report A 33-year-old woman was referred with a history of unilateral post-LASIK ectasia in her left eye, 18 months post operatively. Her best-corrected visual acuity was 20/20 with a manifest refraction of +1.75 (–4.75 × 90). Orbscan ii® revealed an inferior steepening associated with irregular astigmatism. The preoperative Placido topographies revealed a slight skewed radial axis in the right eye associated with an inferior-superior keratometry difference of 1.6 Diopters at 3 mm. in the left eye that developed ectasia, regular symmetric astigmatism was present. Uncorrected visual acuity improved to 20/25 2 weeks after keraRing® segment insertion. How to cite this article Berguiga M, saad a, Gatinel D. Unilateral Post-LASIK Ectasia in a Topographical Normal Eye with a slight asymmetry in the Contralateral Eye. int J kerat Ect Cor Dis 2014;3(1):47-51.

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