foveola

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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

(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)
References in periodicals archive ?
Kato et al., "Enlargement of foveal avascular zone in diabetic eyes evaluated by en face optical coherence tomography angiography," Retina, vol.
Cooper et al., "Relationship between the foveal avascular zone and foveal pit morphology," Investigative Ophthalmology and Visual Science, vol.
Caption: Figure 3: Images of [beta]-peripapillary atrophy in a fundus colour paragraph (a, d, e), foveal avascular zone and vessel images of the superficial retinal plexus (b), deep retinal plexus (c), and radial peripapillary capillaries (f) using optical coherence tomography angiography in areas of 3.0 x 3.0 [mm.sup.2] and 4.5 x 4.5 [mm.sup.2].
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.
Braganza, "Dimensions of the foveal avascular zone using the Heidelberg retinal angiogram-2 in normal eyes," Indian Journal of Ophthalmology, vol.
Khoo et al., "Correlation of foveal avascular zone size with foveal morphology in normal eyes using optical coherence tomography angiography," Retina, vol.
In diabetic patients without diabetic retinopathy, some studies have put forward a theory concerning infraclinical microvascular changes: the asymmetry and enlargement on the foveal avascular zone (FAZ) area [15, 16, 23, 24] and the presence of capillary nonperfusion areas adjacent to the FAZ [16,25].
No difference was noticed either when looking for irregular outlines and punched out borders of the foveal avascular zone (FAZ), as well as nonperfusion areas or morphological capillary network abnormalities (i.e., dilated capillaries, capillary loops, and blind-end capillaries).
Hard exudates with retinal thickening 500pm or less from center of foveal avascular zone.
Swept-source optical coherence tomography angiography (SS-OCT-A) imaging of the right fundus (Triton, Topcon) (Figure 2) demonstrated the aberrant vessel encroaching into the foveal avascular zone (FAZ) but not passing through the center of the fovea.
(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.