名詞 retina:

1. the light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve

1. The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.
   屈光正常當平行光線恰好聚焦于視網膜并形成清晰視覺時正常眼睛的狀態(tài)
2. A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.
   光度視網膜亮度單位，相當于每平方米有一燭光亮度的表面，通過一平方毫米的瞳孔區(qū)域，到達視網膜的光線數量
3. The optical system of the eye stimulate cell of the retina.
   眼睛的視覺系統(tǒng)刺激視網膜內的細胞。
4. Sight is made possible by rays of light impinging on the retina.
   由於光線射到視網膜上，眼睛才看得見。

ret.i.na

n.（名詞）
【復數】 ret.i.nas 或 ret.i.nae [rμt.n-ô.]
A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.
視網膜：襯于內眼球的精細、多層、能感光的膜，并通過視神經連接大腦

來源：
Middle English
中古英語
from Medieval Latin rôtina
源自 中世紀拉丁語 rôtina
from Latin rôte [net]
源自 拉丁語 rôte [網]

【引伸】
ret.inal
adj.（形容詞）