Prediction error in iris suture fixated intraocular lenses and long-term stability.

IMPORTANCE: Little evidence exists for prediction error in iris-sutured intraocular lenses. BACKGROUND: To determine the magnitude of prediction error in iris-sutured intraocular lenses, associated factors and their long-term stability. DESIGN: Retrospective, nonrandomized, noncomparative case series conducted at the Wilmer Eye Institute (Baltimore, Maryland, United States). PARTICIPANTS: Adult patients with subluxated intraocular lenses that underwent iris-suture fixation between January 2000 and December 2014 by a single surgeon. Pregnant women, children (below the age of 18) and cases with follow-up under 1 month were excluded. METHODS: Prediction error was calculated in 60 eyes and survival analysis was performed on 99 eyes. MAIN OUTCOME MEASURES: Prediction error (the difference between the postoperative manifest refraction in spherical equivalent and the spherical equivalent predicted by the Barrett Universal II, Holladay 2 and SRK/T formulas), preoperative and postoperative distance-corrected visual acuity, manifest refraction, frequency of postoperative complications and time until re-subluxation. RESULTS: Mean prediction error using the Barrett formula was -0.35 ± 1.0 D. Higher axial length (≥25.5 mm) was associated with greater prediction error (-0.72 ± 1.11 D vs -0.18 ± 0.91 D, P = .048). Twelve re-subluxations occurred over a mean follow-up period of 30.28 ± 41.86 months. The predicted 50% survival of iris-sutured lenses was 114.25 months. CONCLUSIONS AND RELEVANCE: Iris-suture fixation may require moderate lens power adjustment to compensate for prediction error, especially in eyes with higher axial length. Longer follow-up demonstrates that iris-suture fixation remains a viable technique, yet re-subluxations require routine monitoring of such eyes.

Post-FDA Approval Results of Epithelium-Off, Full-Fluence, Dresden Protocol Corneal Collagen Crosslinking in the USA.

INTRODUCTION: The purpose of this non-comparative, prospective, observational study was to evaluate the post-US Food and Drug Administration approval outcomes of epithelium-off, full-fluence, Dresden protocol corneal collagen crosslinking (CXL) for the treatment of progressive keratoconus (KCN) and post-refractive corneal ectasia at a US academic tertiary medical center. METHODS: This study involved 125 eyes of 97 patients with KCN and 13 eyes of 12 patients with post-refractive ectasia which underwent CXL between November 2016 and September 2019. Best spectacle-corrected visual acuity (BSCVA) and corneal topographic parameters were measured preoperatively, at postoperative month 1 (POM-1), and between postoperative months 3 and 24 (POM 3-24). RESULTS: Best spectacle-corrected visual acuity, flat keratometry, steep keratometry, and mean corneal power worsened at POM-1 (p < 0.01) with a return to preoperative values at POM 3-24. Maximum keratometry (Kmax) steepened at POM-1 and then improved beyond preoperative levels at POM 3-24 (p < 0.01 and p = 0.03, respectively). Pachymetry at the apex and pupil decreased at POM-1 and POM 3-24 (p = 0.03). Pachymetry at the thinnest point decreased at POM-1 and trended toward reduction at POM 3-24 (p < 0.001 and p = 0.06, respectively). Visual and tomographic outcomes were similar between pediatric and adult populations, and between KCN and post-refractive ectasia patients. CONCLUSIONS: Real-world results of CXL in the USA are similar to those reported in prior studies, demonstrating an initial worsening of BSCVA, pachymetry, and keratometry followed by corneal flattening and preservation of visual acuity. Improvements in Kmax and stability in visual acuity were observed over 24 months in children and adults with progressive KCN or post-refractive ectasia.

A Cross-Sectional Study of the Availability of Azithromycin in Local Pharmacies and Associated Antibiotic Resistance in Communities in Kilosa District, Tanzania.

Mass drug administration (MDA) for trachoma control using azithromycin has generated concern for the development of resistant organisms. However, the contribution from azithromycin available in local pharmacies has not been studied. In Kilosa district, Tanzania, MDA stopped over 4 years ago, and this study sought to determine the availability of azithromycin in local pharmacies and correlate it with azithromycin resistance in children born after MDA. A cross-sectional survey was conducted in 644 randomly selected hamlets in Kilosa district, in which the presence of a pharmacy and the availability of azithromycin and erythromycin were determined. In 30 randomly selected hamlets, a random sample of 60 children less than 5 years were tested for azithromycin-resistant Streptococcus pneumoniae (Spn) and Escherichia coli (Ec), from nasopharyngeal and rectal swabs, based on disk diffusion criteria. Only 26.6% of hamlets had a pharmacy. Azithromycin and erythromycin were available in 30.8% and 89.1% of pharmacies closest to the hamlets, respectively. In the 30 communities tested for resistance, the overall prevalence of azithromycin-resistant Spn isolates was 14%. Six of seven (87%) hamlets where azithromycin was available had resistant Spn, compared with 14 of 23 (61%) hamlets without availability. Similarly, six of seven (87%) hamlets where azithromycin was available had resistant Ec isolates compared with 21 of 23 (70%) hamlets without availability. However, the differences were not statistically significant (P = 0.46 and 0.49, respectively). The availability of azithromycin in pharmacies in the district was limited, and a strong correlation with azithromycin-resistant Spn or Ec was not observed.

The "F" in SAFE: Reliability of assessing clean faces for trachoma control in the field.

BACKGROUND: Although facial cleanliness is part of the SAFE strategy for trachoma there is controversy over the reliability of measuring a clean face. A child's face with no ocular and nasal discharge is clean and the endpoint of interest, regardless of the number of times it must be washed to achieve that endpoint. The issue of reliability rests on the reproducibility of graders to assess a clean face. We report the reproducibility of assessing a clean face in a field trial in Kongwa, Tanzania. METHODS/FINDINGS: Seven graders were trained to assess the presence and absence of nasal and ocular discharge on children's faces. Sixty children ages 1-7 years were recruited from a community and evaluated independently by seven graders, once and again about 50 minutes later. Intra-and inter-observer variation was calculated using unweighted kappa statistics. The average intra-observer agreement was kappa = 0.72, and the average inter-observer agreement was kappa = 0.78. CONCLUSIONS: Intra-observer and inter-observer agreement was substantial for the assessment of clean faces using trained Tanzania staff who represent a variety of educational backgrounds. As long as training is provided, the estimate of clean faces in children should be reliable, and reflect the effort of families to keep ocular and nasal discharge off the faces. These data suggest assessment of clean faces could be added to trachoma surveys, which already measure environmental improvements, in districts.