Effect of hydrogen coverage on elastic and optical properties of silicene: a first-principle study.

The structural, electronic, and optical properties of hydrogenated silicene have been investigated using first-principles DFT calculations. Compared to pristine silicene, hydrogenated silicene exhibits high stability, reduced anisotropy, and less birefringence. Hydrogenated silicene shows a constant refractive index in the visible region, increasing exponentially in silicene.

Study on stereoacuity and associated factors in school children aged 7 to 14 years.

Purpose: The study aimed to estimate the prevalence of subnormal stereoacuity in school children and to assess the factors associated with it.

Methods: In this prospective cross-sectional study, a total of 2,376 school children without amblyopia and manifest squint were screened by the titmus fly test, Snellen chart, tests for heterophoria, anterior segment examination, and fundoscopy. Children with a manifest squint, amblyopia (best-corrected visual acuity [BCVA] <6/18), and history of ocular trauma or surgery, and one-eyed children were excluded.