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Human Eye. Cyanopsia is a rare visual phenomenon characterized by a blue tint to vision. Most commonly associated with cataract surgery and certain medications, such as sildenafil, cyanopsia is typically a temporary side effect rather than a standalone disease.
Wikipedia:Dark mode (gadget) - Under the "Appearance" section of the "Gadgets" tab, select the checkbox for "Dark mode toggle". Once checked, dark mode is available to toggle in the preferences portlet, located in the Upper Right-Hand corner of the page. The link to click is named "Dark mode", and is to the left of the "Watchlist" link.
The sclera's blood vessels are mainly on the surface. Along with the vessels of the conjunctiva (which is a thin layer covering the sclera), those in the episclera render the inflamed eye bright red. [6] In many vertebrates, the sclera is reinforced with plates of cartilage or bone, together forming a circular structure called the sclerotic ring.
The entrance pupil is typically about 4 mm in diameter, although it can range from 2 mm (f /8.3) in a brightly lit place to 8 mm (f /2.1) in the dark. The latter value decreases slowly with age; older people's eyes sometimes dilate to not more than 5–6mm in the dark, and may be as small as 1mm in the light. [26] [27]
You can also manually set it to dark mode by going to the settings, and looking for the dark mode toggle under “Display and Sound. You can read more about the options here .
A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [2] The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral ...
However, there is a study that found that dark-eyed people perform better at "reactive-type tasks", which suggests they may have better reaction times. [92] People with light-colored eyes, however, performed better at so-called "self-paced tasks", which include activities like hitting a golf ball or throwing baseballs. [ 92 ]
Amaurosis fugax (Ancient Greek: ἀμαύρωσις, amaurosis meaning 'darkening', 'dark', or 'obscure', Latin: fugax meaning 'fleeting') is a painless temporary loss of vision in one or both eyes. [3]