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The lighthouse's beacon remained a first-class navigational light until August 1927 when the Barnegat Lightship was anchored 8 nautical miles (15 km; 9.2 mi) off the coast. This prompted the automation [broken anchor] and replacement of the first-order lens with a gas blinker. As a result, the tower's light was reduced by over 80 percent.
Cataract surgery, also called lens replacement surgery, is the removal of the natural lens of the eye that has developed a cataract, an opaque or cloudy area. [1] The eye's natural lens is usually replaced with an artificial intraocular lens (IOL) implant.
Clear lens extraction, also known as refractive lensectomy, custom lens replacement or refractive lens exchange is a surgical procedure in which clear lens of the human eye is removed. Unlike cataract surgery , where the cloudy lens is removed to treat a cataract , clear lens extraction is done to surgically correct refractive errors such as ...
An intraocular lens (IOL) is a lens implanted in the eye usually as part of a treatment for cataracts or for correcting other vision problems such as near-sightedness (myopia) and far-sightedness (hyperopia); a form of refractive surgery.
The aim of an accurate intraocular lens power calculation is to provide an intraocular lens (IOL) that fits the specific needs and desires of the individual patient. The development of better instrumentation for measuring the eye's axial length (AL) and the use of more precise mathematical formulas to perform the appropriate calculations have significantly improved the accuracy with which the ...
The introduction of jet airliners in 1958 heralded major change for the ocean liner industry. In 1960 a government-appointed committee recommended the construction of project Q3, a conventional 75,000 GRT liner to replace Queen Mary. Under the plan, the government would lend Cunard the majority of the liner's cost. [34]
The DA* lenses are more expensive and generally feature improved light transmission and larger aperture openings for better low light performance. Some DA* lenses also feature both body driven screw drive focusing and the Pentax SDM (Supersonic Drive Motor) lens based focus mechanism. Some lenses of this product line were co-developed with ...
Ocean optics is the study of how light interacts with water and the materials in water. Although research often focuses on the sea, the field broadly includes rivers, lakes, inland waters, coastal waters, and large ocean basins.