A surgical clamp designed to hold or grasp tissue during dissection, commonly used to grasp the cervix. [L. a holder, fr. teneo, to hold]. /teÂ·nacÂ·uÂ·lum/ (tÄ-nakÂ´u-lum) a hooklike surgical instrument for grasping and holding parts.
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3. Get plenty of vitamin A. This vitamin helps improve your vision in the dark and prevent night blindness. Several foods are rich in vitamin A. 1  Carrots. 2  For decades carrots have been hailed as the food for good vision. 3  They're packed with vitamin A and are a great food for maintaining eyesight. 4  Sweet potato. 5  Eggs.