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oculus sinister (left eye) OU oculus uterque (both eyes) PD Pupillary distance PERRLA Pupils equal, round, reactive to light and accommodation PH Pinhole see Pinhole occluder and Visual_acuity#Legal_definitions: PHNI Pinhole No Improvement see Pinhole occluder and Visual_acuity#Legal_definitions: PHVA Pinhole Visual Acuity: PL Perception of light
Acronym Finder (AF) is a free, online, searchable dictionary and database of abbreviations (acronyms, initialisms, and others) and their meanings. The entries are classified into categories such as Information Technology, Military/Government, Science, Slang/Pop Culture etc. It also contains a database of the United States and Canadian postal codes.
The Glossary of Digital Photography. Rocky Nook, 2007, ISBN 1-933952-04-0. Peres, Michael R. The Focal Encyclopedia of Photography, Fourth Edition. Focal, 2007, ISBN 0-240-80740-5. Taylor, Phil. Digital Photographic Imaging Glossary. Trafford, 2006, ISBN 1-55369-253-5. Glossary, issued by Nikon, explaining the Nikkor lens codes. Retrieved 2011 ...
ROTSE – (observing program/telescope) Robotic Optical Transient Search Experiment, an observing program for detecting the optical counterparts of gamma ray bursts; also the telescopes used in this program; RQQ – (celestial object) radio-quiet quasar a quasar that produces weak radio emission
Lists of acronyms contain acronyms, a type of abbreviation formed from the initial components of the words of a longer name or phrase. They are organized alphabetically and by field. They are organized alphabetically and by field.
Subscripts 1 and 2 refer to initial and final optical media respectively. These ratios are sometimes also used, following simply from other definitions of refractive index, wave phase velocity, and the luminal speed equation:
Optics is the science of light and its interaction with matter.. Optics is a broad subject area. Much of the content is covered in subcategories. Many basic concepts are covered in Category:Geometrical optics, in which light is considered as if it were composed of rays.
An optical system that produces no net convergence or divergence of the beam, i.e. has an infinite effective focal length. [7] This type of system can be created with a pair of optical elements where the distance between the elements is equal to the sum of each element's focal length ( d = f 1 + f 2 {\displaystyle d=f_{1}+f_{2}} ).