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  2. Intraocular lens power calculation - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens_power...

    Through normal eyes an average velocity of 1555 m/s is accepted for calculation. Modern instruments use separate sound velocities for the different eye components to obtain the total axial length. The measured transit time is converted to a distance using the formula d=t/v Where d is the distance, t is the time and v is the velocity. [1]

  3. Multifocal diffractive lens - Wikipedia

    en.wikipedia.org/wiki/Multifocal_diffractive_lens

    A multifocal diffractive lens is a diffractive optical element (DOE) that allows a single incident beam to be focused simultaneously at several positions along the propagation axis. [1] Example of multifocal peak intensity distribution along optical axis.(Courtesy of Holo/Or) Intensity distribution of multifocal lens 5 foci in Z-X plane

  4. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    1 History. 2 Advantages and use. ... the higher the addition. They are also known as multifocal lenses, progressive ... manufacturers claim acceptance rates of 90% ...

  5. Multifocal intraocular lens - Wikipedia

    en.wikipedia.org/wiki/Multifocal_intraocular_lens

    People who have a multifocal intraocular lens after their cataract is removed may be less likely to need additional glasses compared with people who have standard monofocal lenses. [2] People receiving multifocal lenses may experience more visual problems, such as glare or haloes (rings around lights), than with monofocal lenses. [2]

  6. Specific activity - Wikipedia

    en.wikipedia.org/wiki/Specific_activity

    [1] [2] It is usually given in units of becquerel per kilogram (Bq/kg), but another commonly used unit of specific activity is the curie per gram (Ci/g). In the context of radioactivity , activity or total activity (symbol A ) is a physical quantity defined as the number of radioactive transformations per second that occur in a particular ...

  7. The president pitched the idea as a cost-saving measure, arguing that sending U.S. criminals overseas for a “small fee” would cost less than domestic imprisonment.

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