What do lens sutures represent?
What do lens sutures represent?
Lens sutures represent junctions between the tips of the lens fibers that make up the lens cortex. Suture lines usually form an upright “Y” anteriorly and an inverted “Y” posteriorly.
How are lens sutures formed?
By the end of the infantile period, 12 straight fibers, positioned equidistantly around the equator, separate growth shells into equal groups of S-shaped fibers with ends that abut and overlap to form a simple star suture. (Adapted from Kuszak JR: The development of lens sutures.
What is suture cataract?
Sutural cataracts are congenital lens opacities that affect the Y sutures of fetal lens nucleus and usually very slow to progress. Sutural cataracts cause minimal visual disturbance and usually do not require surgical intervention.
What causes cataract?
Most cataracts develop when aging or injury changes the tissue that makes up the eye’s lens. Proteins and fibers in the lens begin to break down, causing vision to become hazy or cloudy. Some inherited genetic disorders that cause other health problems can increase your risk of cataracts.
What are lens Fibres?
Lens fibers They are long, thin, transparent cells, firmly packed, with diameters typically 4–7 micrometres and lengths of up to 12 mm long. The lens fibers stretch lengthwise from the posterior to the anterior poles and, when cut horizontally, are arranged in concentric layers rather like the layers of an onion.
WHAT IS lens anatomy?
The lens consists of the lens capsule, the lens epithelium, and the lens fibers. The lens capsule is the smooth, transparent outermost layer of the lens, while the lens fibers are long, thin, transparent cells that form the bulk of the lens.
What are lens fibres made of?
New lens fibers are generated from the equatorial cells of the lens epithelium, in a region referred to as the germinative zone. The lens epithelial cells elongate, lose contact with the capsule and epithelium, synthesize crystallin, and then finally lose their nuclei (enucleate) as they become mature lens fibers.
What is the purpose of the lens?
The main function of the lens is to transmit and focus the light onto the retina in order to create clear images of observed objects at various distances. The lens is also the main structure of the accommodation reflex. This reflex is activated when the eye focuses on closer objects.
What are the types of sutures?
There are two varieties of sutures: absorbable and non-absorbable.
What is bridle suture?
[ brīd′l ] n. A suture passed through the superior rectus muscle to rotate the globe downward in eye surgery.
What are lens Fibres made of?
What is the lens epithelium?
Lens epithelial cells are the parental cells responsible for growth and development of the transparent ocular lens. Many elegant investigations into their biology have focused on the factors that initiate and regulate lens epithelial cell differentiation.
Where is the lens in body?
the eye
The lens is located in the eye. By changing its shape, the lens changes the focal distance of the eye. In other words, it focuses the light rays that pass through it (and onto the retina) in order to create clear images of objects that are positioned at various distances.
What disease is caused by damage to the lens?
Cataract. Cataract is a clouding of the eye’s lens and is the leading cause of blindness worldwide, and the leading cause of vision loss in the United States.
What are the lens fibers?
WHAT IS lens made of?
Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing.
What do sutures look like in the eye?
Lens sutures seen in the eye (Video) In this video, you can see the normal suture lines that form in the lens with normal eye development. In the front of the lens is a “Y” while in the back, the “Y” is inverted (like a mercedes sign). This is a subtle finding and easier to see in a young eye.
What are the sutures of the crystalline lens?
The sutures of the crystalline lens have previously been studied by light microscopy (LM). While the gross suture patterns (umbilical, line, y-shaped and star) of lenses are readily visualized by LM, fiber cell shape, curvature, length and the morphology of fiber cell ends cannot be adequately resolved by this technique.
How do you tie a suture with two needles?
Next, cut off both needles and tie the ends of both loops diagonally together with 6-8 locking knots. Optionally, tie each loop to itself. During the last stitch, do not pull the loop completely through, cut off the needle and cross one end of the suture under the remaining loop.
What are Langer’s lines and surgical incisions?
Langer’s Lines and Surgical Incisions. Langer’s lines, which are sometimes referred to as the skin cleavage lines, are a series of lines drawn topographically across the human body. They correspond to the natural orientation of collagen fibres in the dermis and usually lie parallel to underlying muscle fibres.