Aims: To assess the long term refractive and visual outcome of patients who have laser in situ keratomileusis (LASIK) surgery.Methods: This was a retrospective study of visual and refractive outcome of patients who had LASIK surgery performed in 1998 and 1999. All levels of myopia were included in the study. 49 patients attended for follow up. The main outcome measures were safety, predictability, efficacy, and stability. Postoperative complications and aberrations were also recorded. The mean preoperative spherical equivalent was 24.85. Results: At 2 months postoperatively 67% of eyes were within plus or minus 0.5D of attempted correction with 81% within plus or minus 1.0D. At 5 years postoperatively 60% of eyes were within plus or minus 0.5D of attempted correction with 83% within plus or minus 1.0D. 88% of eyes had a vision of 6/12 or better at 2 months compared to 89% of eyes at 5 years. Best spectacle corrected visual acuity (BSCVA) was unchanged or improved in 51%. No eye lost more than one line of BSCVA. Overall, there was regression towards myopia with a mean change in refraction of 20.5D over the 5 years. As expected, severely myopic patients regressed more with a mean change of 21.06D. However, there was a high level of patient satisfaction with the surgery. Conclusion: LASIK surgery offers predictable results in terms of refractive and visual outcome with mild regression in refraction over time.

Overcoming poor readout is an increasingly urgent challenge for devices based on solid-state spin defects, particularly given their rapid adoption in quantum sensing, quantum information, and tests of fundamental physics. However, in spite of experimental progress in specific systems, solid-state spin sensors still lack a universal, high-fidelity readout technique. Here we demonstrate high-fidelity, room-temperature readout of an ensemble of nitrogen-vacancy centers via strong coupling to a dielectric microwave cavity, building on similar techniques commonly applied in cryogenic circuit cavity quantum electrodynamics. This strong collective interaction allows the spin ensemble’s microwave transition to be probed directly, thereby overcoming the optical photon shot noise limitations of conventional fluorescence readout. Applying this technique to magnetometry, we show magnetic sensitivity approaching the Johnson–Nyquist noise limit of the system. Our results pave a clear path to achieve unity readout fidelity of solid-state spin sensors through increased ensemble size, reduced spin-resonance linewidth, or improved cavity quality factor.

Artisan iris-claw implants are safe and effective in the correction of aphakia in children following lensectomy for ectopia lentis, enabling good spectacle-free distance vision in 75% of eyes with no postoperative complications.

Treatment of lab-grown diamond by electron irradiation and annealing has enabled quantum sensors based on negatively-charged nitrogen-vacancy (NV -) centers to demonstrate record sensitivities. Here we investigate the irradiation and annealing process applied to 28 diamond samples using a new ambient-temperature, all-optical approach. As the presence of the neutrally-charged nitrogenvacancy (NV 0 ) center is deleterious to sensor performance, this photoluminescence decomposition analysis (PDA) is first employed to determine the concentration ratio of NVto NV 0 in diamond samples from the measured photoluminescence spectrum. The analysis hinges on (i) isolating each NV charge state's emission spectrum and (ii) measuring the NVto NV 0 emission ratio, which is found to be 2.5˘0.5 under low-intensity 532 nm illumination. Using the PDA method, we measure the effects of irradiation and annealing on conversion of substitutional nitrogen to NV centers. Combining these measurements with a phenomenological model for diamond irradiation and annealing, we extract an estimated monovacancy creation rate of 0.52˘0.26 cm -1 for 1 MeV electron irradiation and an estimated monovacancy diffusion coefficient of 1.8 nm 2 /s at 850˝C. Finally we find that irradiation doses Á 10 18 e -/cm 2 deteriorate the NVdecoherence time T2 whereas T1 is unaffected up to the the maximum investigated dose of 5ˆ10 18 e -/cm 2 . :1906.11406v1 [cond-mat.mes-hall] arXiv

Intracameral triamcinolone provided a safe and useful adjunct to topical steroid drops after pediatric cataract surgery.