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  2. Lens (hydrology) - Wikipedia

    en.wikipedia.org/wiki/Lens_(hydrology)

    A freshwater lens on an island. In hydrology, a lens, also called freshwater lens or Ghyben-Herzberg lens, is a convex layer of fresh groundwater that floats above the denser saltwater and is usually found on small coral or limestone islands and atolls.

  3. Clear lens extraction - Wikipedia

    en.wikipedia.org/wiki/Clear_lens_extraction

    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 ...

  4. Cataract surgery - Wikipedia

    en.wikipedia.org/wiki/Cataract_surgery

    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.

  5. 1951 USAF resolution test chart - Wikipedia

    en.wikipedia.org/wiki/1951_USAF_resolution_test...

    A USAF 1951 resolution chart in PDF format is provided by Yoshihiko Takinami. This chart should be printed such that the side of the square of the 1st element of the group -2 should be 10 mm long. USAF 1951 Resolution Target Further explanations and examples; Koren 2003: Norman Koren's updated resolution chart better suited for computer analysis

  6. Stowage plan for container ships - Wikipedia

    en.wikipedia.org/wiki/Stowage_plan_for_container...

    Hatch cover clearance – Hatch cover clearance refers to how many "High Cube" (height over 8.6 ft (2.6 m)) containers allowed to load in the hold without preventing the hatch cover from closing correctly. [3] Visibility – The number of High cube containers shouldn't exceed a set number of High cube containers in each row/bay on-deck.

  7. Open hatch bulk carrier - Wikipedia

    en.wikipedia.org/wiki/Open_hatch_bulk_carrier

    The open hatch bulk carrier, often referred to as OHBC or conbulker, is designed to offer direct access to the hold through cargo hatches which extend the full width of the vessel. As a result, large cargo units can be lowered into place. If it is possible, the holds or hatches are designed around standard cargo unit sizes.

  8. Marine insurance - Wikipedia

    en.wikipedia.org/wiki/Marine_insurance

    Overdue insurance: This is a form of insurance now largely obsolete due to advances in communications. It was an early form of reinsurance and was bought by an insurer when a ship was late at arriving at her destination port and there was a risk that she might have been lost (but, equally, might simply have been delayed).

  9. Underwater vision - Wikipedia

    en.wikipedia.org/wiki/Underwater_vision

    Scuba diver with bifocal lenses fitted to a mask. Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors.. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through