Ωχρή κηλίδα: Διαφορά μεταξύ των αναθεωρήσεων
Περιεχόμενο που διαγράφηκε Περιεχόμενο που προστέθηκε
imported>Pheidias μ Removed modifier "severe" from description of macular degeneration |
Χωρίς σύνοψη επεξεργασίας |
||
Γραμμή 5:
The '''macula''' or '''macula lutea''' (from [[Latin]] ''macula'', "spot" + ''lutea'', "yellow") is an oval [[yellow]] spot near the center of the [[retina]] of the human [[eye]]. It has a diameter of about 1.5 mm and is often histologically defined as having two or more layers of [[ganglion cell]]s. Near its center is the [[fovea]], a small pit that contains the largest concentration of [[cone cell]]s in the eye and is responsible for central vision.
It is specialized for high [[Visual acuity|acuity]] vision. Within the macula are the fovea and foveola which contain a high density of [[cones]] (photoreceptors with high acuity). Whereas loss of [[peripheral vision]] may go unnoticed for some time, damage to the macula will result in loss of central vision, which is usually immediately obvious.
The progressive destruction of the macula is a [[disease]] known as [[macular degeneration]].
| |||