foveola

(redirected from avascular zone)
Also found in: Dictionary, Encyclopedia.

foveola

 [fo-ve´o-lah] (pl. fove´olae) (L.)
a minute pit or depression.

fo·ve·o·la

, pl.

fo·ve·o·lae

(fō-vē'ō-lă, -lē), [TA] Avoid the mispronunciation foveo'la. Do not confuse this word with faveolus.
A minute fovea or pit.
[Mod. L. dim. of L. fovea, pit]

foveola

/fo·ve·o·la/ (fo-ve´o-lah) pl. fove´olae   [L.] a minute pit or depression.

foveola

(fō-vē′ə-lə)
n. pl. foveo·lae (-lē′) or foveo·las
A small fovea.

fo·ve·o·la

, pl. foveolae (fō-vē'ō-lă, -ē) [TA]
A minute fovea or pit.
[Mod. L. dim. of L. fovea, pit]

foveola

The base of the fovea centralis with a diameter of about 0.35 mm (or about 1º of the visual field). The image of the point of fixation is formed on the foveola in the normal eye. The foveola contains cone cells only (rod-free area). The foveal avascular zone is slightly larger (about 0.5 mm in diameter) (Fig. F9). Syn. fovea (term often used by clinicians). See eccentricity; fixation; umbo.
Fig. F9 Cross-section of the retina showing the fovea centralis and foveola (rod-free area)enlarge picture
Fig. F9  Cross-section of the retina showing the fovea centralis and foveola (rod-free area)

foveola

pl. foveolae [L.] a minute pit or depression.
References in periodicals archive ?
Ishida and coworkers (44) showed that placement of a plateletrich gel into avascular zone tears in rabbits significantly improved healing on histologic examination.
For complex, recurrent, or avascular zone tears, particularly when surgery is limited to meniscal work, consideration should be given to augmenting the repair with a fibrin clot or platelet-rich plasma.
Repairs by trephination and suturing of longitudinal meniscal injuries in the avascular zone in goats.
Arthroscopic repair of meniscal tears that extend into the avascular zone.
7 Our patient had enlargement of the foveal avascular zone, perifoveal capillary telangiectasia and widespread venous beading in both eyes on FFA.
The exact location of the foveal avascular zone can be determined by fluorescence angiography.
18) Clinical features include enlarged foveal avascular zone, which is normally 300-500 microns and this is indicated by the presence of increased capillary dropouts on FFA.
Disturbance in permeability of either retinal capillaries, endothelium, retinal pigment epithelium results in retinal oedema and FFA shows late diffuse hyperfluorescence and macular ischaemia is due to reduced blood flow to the macular region and FFA shows increased foveal avascular zone with larger areas of capillary non-perfusion.
Hard exudates with retinal thickening 500pm or less from center of foveal avascular zone.
Retinal thickening one disc area or larger in size located within one disc area of foveal avascular zone.
10) Foveal hypoplasia is usually present and manifests as reduced foveal reflex, macular hypo pigmentation and crossing of the usual foveal avascular zone by retinal vessels.