11. The acetabular notch is narrow or closed and on the fovea is absent. 12. Immediately below it are two small but prominent black pits ( fovea ). 13. Its cephalic region is strongly convex, the fovea is sinuous and straight. 14. Cones are found primarily in the center ( or fovea ) of the retina. 15. This differs from tarsiers, which lack a tapetum lucidum but possess a fovea . 16. With only a postorbital bar, lemurs have been unable to develop a fovea . 17. The fovea is employed for accurate vision in the direction where it is pointed. 18. The fovea has a high concentration of the yellow carotenoid pigments lutein and zeaxanthin. 19. Meridians correspond to sections of great circles passing though the centre of the fovea . 20. Birds have acute eyesight fovea which magnifies the central part of the visual field.
