Innehållsförteckning
Vad är blinda fläcken 1177?
Blinda fläcken är ett område i ögats näthinna där syncellernas nervtrådar går ihop till synnerven. Det går inte att se något i denna del av synfältet eftersom näthinnan inte kan ta emot synintryck där.
Var finns blinda fläcken och varför är den blind?
Den punkt på näthinnan där synnerven löper ut heter papillen, men kallas för blinda fläcken eftersom området saknar fotoreceptorer. Det är alltså en fläck i varje ögas synfält där du inte ser något.
What is the sclera and what does it do?
The sclera is tough and fibrous, protecting the interior components of the eye from injury, and makes up the exterior coating of the eye. The sclera forms the entire visible white exterior of the eye, while the iris is the colored portion inside the anterior chamber of the eye.
What is the sclera and where is it located?
The sclera, as separated from the cornea by the corneal limbus. The sclera, also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some crucial elastic fiber.
What does the name sclera mean?
Sclera Definition. The sclera is the dense connective tissue of the eyeball that forms the ”white” of the eye. It is continuous with the stroma layer of the cornea. The junction between the white sclera and the clear cornea is called the limbus. The sclera ranges in thickness from about 0.3 millimeter (mm) to 1.0 mm.
What are the causes of a sclera to turn black?
What are the causes of a sclera to turn black? Dr. Tim Conrad answered. Ophthalmology 34 years experience. Abnormal: The most dangerous thing would be melanoma. This deadly cancer can cause the sclera to turn black. 5k views Answered >2 years ago. Thank. 1 thank. A 32-year-old member asked: