Papilja
16 / 10 / 2020
Apibrėžimas Papilija yra akies tinklainės sritis. Čia visi tinklainės nerviniai pluoštai susilieja ir palieka akies obuolį kaip sujungtą nervinę virvelę, kad galėtų perduoti
Apibrėžimas Papilija yra akies tinklainės sritis. Čia visi tinklainės nerviniai pluoštai susilieja ir palieka akies obuolį kaip sujungtą nervinę virvelę, kad galėtų perduoti
Papiloidinė edema Papilledema, dar vadinama perkrovos mokiniu, yra regos nervo galvos patologinis išsipūtimas, kuris paprastai yra šiek tiek išgaubtas. Skirtingai nuo regos disko kasimo, padidėja regos nervo slėgis iš užpakalio, dėl kurio jis išsikiša į priekį. Priežastys
Definition The human eye has two types of photoreceptors that enable us to see. On the one hand there are the rod receptors and on the other hand the cone receptors, which are subdivided again: blue, green and red receptors.
Function The photoreceptors of the human eye are used to detect incident light. The eye is sensitive to light rays with wavelengths between XNUMX and XNUMX nm. This corresponds to the colors from blue to green to red. Light rays
Tasks As described above, the cone receptors serve for daytime vision. Through the three types of cones (blue, red and green) and a process of additive color mixing, the colors we see can be seen. This process is different from
Distribution Due to their different tasks, the cones and rods in the eye are also distributed differently in their density. The cones serve for sharp vision with color differentiation during the day. They are therefore most common in the center
Yellow dot The macula lutea, also called the yellow dot, is the place on the retina with which people primarily see. It was named after the yellowish coloration of this spot when the back of the eye is mirrored. The
Visual dye The human visual pigment consists of a glycoprotein called opsin and the so-called XNUMX-cis-retinal, which is a chemical modification of vitamin AXNUMX. This is also the reason why vitamin A is so important for visual acuity. Severe deficiency