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medium spring-open used to cut the external side of the cornea, fine sutures; iris, etc. •de' Wecker's iris scissors: small slender spring-open scissors for intraoccular maneuvers (iris and deeper and more delicate structures); has two wings to operate it and one sharp and one blunt blade. •Vannas' scissors
The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, behind the stroma, pigmented epithelial cells.. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds.
A key-hole pupil is left by the removal of a wedge-shaped section of iris. [4] A stenopeic iridectomy is the surgical removal of a narrow slit or a minute portion of the iris, leaving the sphincter pupillae muscle intact. [2] A therapeutic iridectomy is the surgical removal of a portion of the iris for the cure or prevention of an ocular ...
The IRIS makes the pupil smaller in bright light and larger in dim light. In this way, the IRIS regulates how much light can enter through the pupil. Hooray for science in the crossword!
Essential Pruning Tips. Whether you are pruning a small tree or a perennial, use these pruning tips to promote a healthy, long-lived plant. 1. Remove dead, damaged, and diseased material right away.
Cutting back will improve a plant's overall appearance, adding to an attractive landscape and ensuring beautiful, fresh new growth. Here, experts gave us their tips and tricks for properly pruning ...
Iris florentina is considered one of the irises (with Iris pseudacorus) that inspired the fleur-de-lys (or fleur-de-luce) of heraldry, [13] [18] [12] which was the symbol of the city of Florence for centuries, [18] [5] and is on the coat of arms of the city.
Once the foliage is cut back, add a layer of compost mulch to the border. “This helps put nutrients back into the earth for next year," says Marshall. "It will also protect the plant's crown ...