These authors produced retinal injuries and lens dislocations by impacting the enucleated porcine eyes with BB=s (0.345g) traveling at an average velocity of 66.4 m/s and with an average KE of 0.76 Nm. An intraocular pressure was created by squeezing the exterior surface of the gelatin. Wiedenthal and Schepens (1966) developed an animal model using enucleated porcine eyes supported in a 10% gelatin solution. Injuries were only produced in eyes that ruptured. Wiedenthal (1964) impacted live Rhesus monkey eyes with a 282.6 gm projectile at velocities ranging from 3.3 m/s to 4.6 m/s. There have been very few experimental studies of ocular blunt trauma. Retinal injuries are usually tears in the retina. The capsule that contains the lens or the zonules can be torn, allowing the lens to move from its normal anatomic position (lens dislocation). Typical iris and ciliary body changes are disruption of the iris at its attachment to the ciliary body (iridodialysis), pulling of the ciliary muscles from their insertions at the scleral spur (cyclodialysis) and tears in the ciliary body or the pars plana. These injuries can be generally described as injuries to the iris and ciliary body, lens disruptions and retinal injuries. In the detail, the vitreous body is removed to show peripheral structuresīlunt trauma to the eye can create a constellation of damage to the intraocular structures. The optic disc is the end of the optic nerve and the area where blood vessels enter and exit the eye.Īnatomy of the eye. The retina is the thin lining on the interior rear surface of the eye that converts light signals into the electrical impulses that are sent to the brain via the optic nerve. The vitreous is a clear gelatinous mass that fills the interior space behind the posterior chamber. The posterior chamber is the space between the back of the iris and the vitreous humor. Regulation of intraocular pressure is achieved through the balance of aqueous humor production and outflow. The ciliary body also produces aqueous humor. The lens shape is adjusted by altering the tension in the small ligaments (zonules) that connect the lens to the muscle fibers in the ciliary body. The lens is the clear tissue that focuses the light on the retina. The AC angle is the junction of the front surface of the iris and the back surface of the cornea. The iris is the pigmented tissue behind the cornea that gives color to the eye and controls the amount of light passing through the lens to the retina by adjusting the size of the pupil. The anterior chamber (AC) is the space between the back of the cornea and the iris that is filled with the aqueous humor, a clear fluid. The cornea is the transparent anterior part of the eye that provides most of the eye=s focusing ability. The sclera is the opaque, fibrous outer layer of the eye (white of the eye) that is continuous with the cornea in front and with the sheath for the optic nerve in the back of the eye. The main mechanical structure of the eye comes from the sclera and the cornea. The anatomy of the eye relevant for discussing ocular injury is shown in Figure 1. In order to understand how air bags are producing the isolated ocular injuries, the relationship between blunt ocular impact and injury needs to be better understood. The lack of injury to the surrounding structures indicates that the magnitude of the energy and forces involved are small and do not present a hazard to the other parts of the body. While applying a protective restraining force to the rest of the body, the deploying air bag may impart sufficient localized energy or force to the eye to injure it. injury to the eye without significant injury to the rest of the body ( Duma, 1996). With the introduction of air bags, isolated ocular injuries are occurring, i.e. The typical injury pattern consists of ocular injuries in conjunction with severe injuries to the boney structures and soft tissues that surround the eye. The automotive safety community has been aware that ocular injuries occur in car crashes where large impact forces are placed on the face in association with severe trauma to other body regions.
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Describe the relationship between electricity and magnetism.Explain the significance of the Curie temperature.Describe the role of magnetic domains in magnetization.Whatever is placed inside this coil will then be in a stronger magnetic field than if the wire was uncoiled.įor more information contact MagLab educator Carlos Villa. Coiling the wire concentrates the magnetic field inside the coil. So the wire carrying a DC current will have a small magnetic field around it. The DC current from a battery will create a flow of electrons in the same direction. Ask each group what they could do to make their magnets stronger for the next time they would do this.īy coiling a current carrying wire, you can concentrate the magnetic field in the center of the coil. The variables discussed should include battery strength, neatness of wire coiling, and number of coils. Let the students try a few ideas (number of batteries, more wire, neatness of the coil, temperature, etc…). 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