Khalil S H
Folia Morphol (Praha). 1989;37(2):195-200.
The study showed that the eyeball of Gambusia is spherical and that it has two thin transparent lids--a small upper lid and a larger lower lid. The cornea is composed of four layers, and the lens, which is relatively large, is covered externally by a lens capsule. The lens fibres are arranged in concentric lamellae. The ciliary body is present only on the ventral aspect of the eye. The iris is triangular and is densely pigmented with guanin crystals. As in other vertebrates, the retina consists of ten layers. The hyaloid or retinal artery lies among the optic nerve fibres. The photoreceptor cell layer is generally thick and contains rods and cones. The internal retinal envelope, the choroid coat, appears on the medial aspect of the eyeball as a thickened vascular part, referred to as the suprachoroidal layer. This layer contains a horseshoe-shaped gland, the choroid gland, the outer portion of which is surrounded by a layer of silvery guanin crystals generally termed the argentea.
研究表明，食蚊鱼的眼球呈球形，有两个薄的透明眼睑——一个较小的上眼睑和一个较大的下眼睑。角膜由四层组成，相对较大的晶状体外部被晶状体囊覆盖。晶状体纤维呈同心板层排列。睫状体仅存在于眼球的腹侧。虹膜呈三角形，富含鸟嘌呤晶体色素沉着。与其他脊椎动物一样，视网膜由十层组成。玻璃体或视网膜动脉位于视神经纤维之间。光感受器细胞层通常较厚，包含视杆细胞和视锥细胞。视网膜内包膜，即脉络膜层，在眼球内侧表现为增厚的血管部分，称为脉络膜上层。该层包含一个马蹄形腺体，即脉络膜腺，其外部被一层通常称为银膜的银色鸟嘌呤晶体包围。
