Marc Amsler honor in ophthalmology. Amsler was professor and chief of the Zurich Eye Clinic until 1961. His successor was Rudolf Witmer. He is best known for the Amsler grid test. The Amsler grid was an improvement over the initial work done by the ophthalmologist Edmond Landolt. The grid tests the function of the macula, a part of the retina, so that macular degeneration can be identified. He also contributed to the progress in the understanding of uveitis. Furthermore, he published works on keratoconus. In 1951, Dr. Amsler performed the first corneal transplantation at the Zurich Eye clinic. Marc Amsler Marc Amsler
Off-the-grid countries worldwide. In Africa, small and inexpensive pico solar electric lights and solar home systems are becoming readily available. Inexpensive solar panels, lithium ion batteries and high-efficiency LED lights make the systems affordable. Off-the-grid Off-the-grid is a system and lifestyle designed to help people function without the support of remote infrastructure, such as an electrical grid. In electricity, off-grid can be stand-alone power system or mini-grids typically to provide a smaller community with electricity. "Off-grid electrification" is an approach to access electricity used in countries and areas with little access to electricity, due to scattered or distant population. The term