Predictors of Trachomatous Trichiasis Surgery Outcome.

PURPOSE: Unfavorable outcomes after trachomatous trichiasis (TT) surgery are undermining the global trachoma elimination effort. This analysis investigates predictors of postoperative TT (PTT), eyelid contour abnormalities (ECAs), and granuloma in the 2 most common TT surgery procedures: posterior lamellar tarsal rotation (PLTR) and bilamellar tarsal rotation (BLTR). DESIGN: Secondary data analysis from a randomized, controlled, single-masked clinical trial. PARTICIPANTS: A total of 1000 patients with TT, with lashes touching the eye or evidence of epilation, in association with tarsal conjunctival scarring. METHODS: Participants were randomly allocated and received BLTR (n = 501) or PLTR (n = 499) surgery. Disease severity at baseline, surgical incisions, sutures, and corrections were graded during and immediately after surgery. Participants were examined at 6 and 12 months by assessors masked to allocation. MAIN OUTCOME MEASURES: Predictors of PTT, ECA, and granuloma. RESULTS: Data were available for 992 (99.2%) trial participants (496 in each arm). There was strong evidence that performing more peripheral dissection with scissors in PLTR (odd ratio [OR], 0.70; 95% confidence interval [CI], 0.54-0.91; P = 0.008) and BLTR (OR, 0.83; 95% CI, 0.72-0.96; P = 0.01) independently protected against PTT. Baseline major trichiasis and mixed location lashes and immediate postoperative central undercorrection independently predicted PTT in both surgical procedures. Peripheral lashes in PLTR (OR, 5.91; 95% CI, 1.48-23.5; P = 0.01) and external central incision height ≥4 mm in BLTR (OR, 2.89; 95% CI, 1.55-5.41; P = 0.001) were independently associated with PTT. Suture interval asymmetry of >2 mm (OR, 3.18; 95% CI, 1.31-7.70; P = 0.01) in PLTR and baseline conjunctival scarring in BLTR (OR, 1.72; 95% CI, 1.06-2.81; P = 0.03) were independently associated with ECA. Older age was independently associated with ECA in both PLTR (P value for trend < 0.0001) and BLTR (P value for trend = 0.03). There was substantial intersurgeon variability in ECA rates for both PLTR (range, 19.0%-36.2%) and BLTR (range, 6.1%-28.7%) procedures. In PLTR surgery, irregular posterior lamellar incision at the center of the eyelid (OR, 6.72; 95% CI, 1.55-29.04; P = 0.01) and ECA (OR, 3.08; 95% CI, 1.37-6.94; P = 0.007) resulted in granuloma formation. CONCLUSIONS: Poor postoperative outcomes in TT surgery were associated with inadequate peripheral dissection, irregular incision, asymmetric suture position and tension, inadequate correction, and lash location. Addressing these will improve TT surgical outcomes

Detecting the effect of under-correcting myopia

Dear Editor, The Letter to the Editor “Refractive correction and myopia progression” [1] (“the Letter”) makes some good points about the article “The progression of corrected myopia” [2] that the article had already addressed in part

Visual outcomes of topography-guided excimer laser surgery for treatment of patients with irregular astigmatism

The aim of this study was to evaluate the efficacy, safety, and predictability of topography-guided treatments to enhance refractive status following other corneal surgical procedures. In a prospective case series study, 28 consecutive eyes of 26 patients with irregular astigmatism after radial keratotomy, corneal transplant, small hyperopic and myopic excimer laser optical zones, and corneal scars were operated. Laser-assisted in situ keratomileusis (LASIK) (n = 8) and photorefractive keratectomy (PRK) (n = 20) were performed using the ALLEGRETTO WAVE excimer laser and topography-guided customized ablation treatment software. Preoperative and postoperative uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), manifest and cycloplegic refraction, and corneal topography with asphericity were analyzed in 12 months follow-up. Uncorrected visual acuity (UCVA) changed from 0.2 +/- 0.2 or (20/100 +/- 20/100) to 0.51 +/- 0.31 or (20/40 +/- 20/60) in the LASIK group (P = 0.01) and from 0.34 +/- 0.16 or (20/60 +/- 20/120) to 0.5 +/- 0.23 or (20/40 +/- 20/80) in the PRK group (P = 0.01). Refractive cylinder decreased from -3.2 +/- 0.84 diopters (D) to -2.06 +/- 0.42 D in the LASIK group (P = 0.07) and from -2.25 +/- 0.39 D to -1.5 +/- 0.23 D in the PRK group (P = 0.008). Best corrected visual acuity did not change significantly in either group. Topography-guided treatment is effective in correcting the irregular astigmatism after refractive surgery. Topography-guided PRK can significantly reduce irregular astigmatism and increase the UCVA and BCVA

Cirurgia de catarata congênita com implante de lente intraocular em olhos microftálmicos: resultados visuais e complicações

PURPOSE: To report the visual outcomes and complications of congenital cataract surgery with primary intraocular lens implantation in microphthalmic eyes of children younger than 4 years of age. METHODS:This retrospective interventional case series included 14 microphthalmic eyes from 10 children who underwent congenital cataract surgery with primary intraocular lens implantation younger than 4 years of age. Seven patients had bilateral cataracts (11 eyes met the study's inclusion criteria) and 3 patients had unilateral cataract. Patients' medical charts were reviewed to obtain information regarding the preoperative and postoperative ophthalmological examination. Main outcome measures were intraocular pressure (IOP), best-corrected visual acuity, and intraoperative and postoperative complications. RESULTS: Mean age at the time of surgery was 21.7 ± 2.9 months. Mean ocular axial length was 19.2 ± 0.9 mm. Mean preoperative IOP was 9.7 ± 1.7 mmHg and 10.3 ± 3.1 mmHg on final follow-up (P=0.18). There were no intraoperative complications. Two (15.4%) eyes developed secondary visual axis opacification, of which only one needed to be reoperated due to significantly decreased vision (0.5 logMAR). Preoperative and postoperative best-corrected visual acuity was 2.09 ± 0.97 logMAR and 0.38 ± 0.08 logMAR in bilateral cases and 1.83 ± 1.04 logMAR and 0.42 ± 0.13 logMAR in unilateral cases, respectively. CONCLUSION: Primary intraocular lens implantation in congenital cataract surgery in microphthalmic eyes resulted in a significant best-corrected visual acuity improvement with no intraoperative complications and minimal postoperative complications.OBJETIVOS: Relatar os resultados visuais e as complicações da cirurgia de catarata congênita com implante primário de lente intraocular em olhos microftálmicos de crianças menores de 4 anos. MÉTODOS: Esta série de casos retrospectiva incluiu 14 olhos microftálmicos de 10 crianças menores de 4 anos que foram submetidas à cirurgia de catarata congênita com implante primário de lente intraocular. Sete pacientes tinham catarata bilateral (11 foram incluídos no estudo) e 3 tinham catarata unilateral. Os prontuários dos pacientes foram revisados para se obter informação sobre o exame oftalmológico pré- e pós-operatório. As principais variáveis analisadas foram pressão intraocular, acuidade visual com melhor correção e complicações intra- e pós-operatórias. RESULTADOS: A média da idade dos pacientes na época da cirurgia foi de 21,7 ± 2,9 meses. O diâmetro antero-posterior médio foi de 19,2 ± 0,9 mm. A pressão intraocular média pré-operatória foi 9,7 ± 1,7 mmHg e 10,3 ± 3,1 mmHg no último exame de acompanhamento pós-operatório (P=0,18). Não houve complicações intraoperatórias. Dois (15,4%) olhos desenvolveram opacificação secundária do eixo visual, dos quais um foi reoperado devido à baixa visual significativa (0,5 logMAR). AV pré- e pós-operatórias foram 2,09 ± 0,97 logMAR e 0,38 ± 0,08 logMAR em casos de catarata congênita bilateral e 1,83 ± 1,04 logMAR e 0,42 ± 0,13 logMAR em casos unilaterais, respectivamente. CONCLUSÃO: O implante primário de lente intraocular em cirurgia de catarata congênita em olhos microftálmicos resultou em uma melhora significativa da acuidade visual com nenhuma complicação intraoperatória e com pouca complicação no pós-operatório.Fundação Altino Ventura Department of Congenital CataractHospital de Olhos de Pernambuco Department of Congenital CataractUniversidade Federal de São Paulo (UNIFESP) Department of OphthalmologyUNIFESP, Department of OphthalmologySciEL

Two-dimensional Bragg grating lasers defined by electron-beam lithography

Two-dimensional Bragg grating (2DBG) lasers with two quarter-wave slip line defects have been designed and fabricated by electron-beam lithography and reactive ion etching. Unlike conventional two-dimensional photonic crystal defect lasers, which use a large refractive index perturbation to confine light in a plane, the 2DBG structures described here selectively control the longitudinal and transverse wave vector components using a weak index perturbation. Two line defects perpendicular to each other are introduced in the 2DBG to define the optical resonance condition in the longitudinal and transverse directions. In this article, we describe the lithography process used to pattern these devices. The 2DBG lasers were defined using polymethylmethacrylate resist exposed in a Leica Microsystems EBPG 5000+ electron-beam writer at 100 kV. A proximity correction code was used to obtain a uniform pattern distribution over a large area, and a dosage matrix was used to optimize the laser design parameters. Measurements of electrically pumped 2DBG lasers showed modal selection in both the longitudinal and transverse directions due to proper design of the grating and defects, making them promising candidates for single-mode, high power, high efficiency, large-area lasers

Early outcomes after small incision lenticule extraction and photorefractive keratectomy for correction of high myopia

published_or_final_versio