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Optometry
Of or pertaining to the health care profession concerned with eyes and related structures, as well as vision, visual systems, and vision information processing in humans.
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Optometry > Optical phenomena 
moon dog
Optometry; Optical phenomena
A moon dog, moondog, or mock moon, (scientific name paraselene, plural paraselenae, i.e. "beside the moon") is a relatively rare bright circular spot on a lunar halo ...
false sunrise
Optometry; Optical phenomena
A false sunrise or dawn sundog is a very particular kind of parhelion, belonging to the optical phenomenon family of halos. It is an atmospheric optical phenomenon associated with ...
false sunset
Optometry; Optical phenomena
It is an atmospheric optical phenomenon associated with the reflection and refraction of sunlight by small ice crystals making up cirrus or cirrostratus clouds in the very ...
Fata Morgana
Optometry; Optical phenomena
A Fata Morgana is an unusual and complex form of superior mirage that is seen in a narrow band right above the horizon. It is an Italian phrase derived from the vulgar Latin for ...
glory
Optometry; Optical phenomena
A glory is an optical phenomenon that resembles an iconic saint's halo about the shadow of the observer's head. The effect is believed to happen due to classical wave ...
parhelic circle
Optometry; Optical phenomena
A parhelic circle is a halo, an optical phenomenon appearing as a horizontal white line on the same altitude as the sun, or occasionally the Moon. If complete, it stretches all ...
green flash
Optometry; Optical phenomena
Green flashes and green rays are optical phenomena that sometimes occur right after sunset or right before sunrise. When the conditions are right, a green spot is visible above ...
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- Ophthalmic products (35)
- Optical phenomena (132)