Corneal Ulcer
Corneal Ulcer (Introduction)
The eye is one of the vital organs in a human being. As seen on figure 1, the eye is composed of many different parts and function. The cornea is a clear covering over the colored iris and the pupil of the eye. The function of cornea is to help focus light on the retina and protect the iris, lens, etc. so that the eye can see. The cornea is best to compare with a standard contact lens. Although, the function of a cornea is to protect from harmful microorganisms, it is also vulnerable to those same unicellular organisms.
One of the major diseases affecting the cornea is a corneal ulcer. A corneal ulcer is an "non-penetrating erosion, or open sore in the outer layer of the cornea, the transparent area at the front of the eyeball" (Medlineplus). Corneal Ulcer has many different names, depending on the microorganism that causes the ulcer. Some of the major diseases include Bacterial Keratitis, Fungal Keratitis, Acanthamoeba Keratitis, and Herpes Simplex Keratitis. Bacteria, fungi, amoebae, and viruses are the prime cause for these diseases. These microorganisms settle in the cornea, grow, and feed on the cornea. This process causes a corneal ulceration. Contact lenses are the leading way these microorganisms enter the cornea (discussed later).
There contains multiple symptoms in order to identify corneal ulceration. Some of these symptoms include the following: eye redness, tearing increases, vision impairs, eye burning, itching, and photophobia (sensitive to light) start to develop (Medlineplus). Many different methods of detecting corneal ulcer are present at the doctor's office. Visual acuity test, Slit-lamp test, and Shirmers (tear) test are some of the tests that a doctor conducts during eye examination. Visual acuity test allows the doctor to measure a person's vision by reading the eye chart (figure 6). A Slit-lamp is a specialized magnifying microscope in which a doctor could examine the cornea, iris, and
The eye is one of the vital organs in a human being. As seen on figure 1, the eye is composed of many different parts and function. The cornea is a clear covering over the colored iris and the pupil of the eye. The function of cornea is to help focus light on the retina and protect the iris, lens, etc. so that the eye can see. The cornea is best to compare with a standard contact lens. Although, the function of a cornea is to protect from harmful microorganisms, it is also vulnerable to those same unicellular organisms.
One of the major diseases affecting the cornea is a corneal ulcer. A corneal ulcer is an "non-penetrating erosion, or open sore in the outer layer of the cornea, the transparent area at the front of the eyeball" (Medlineplus). Corneal Ulcer has many different names, depending on the microorganism that causes the ulcer. Some of the major diseases include Bacterial Keratitis, Fungal Keratitis, Acanthamoeba Keratitis, and Herpes Simplex Keratitis. Bacteria, fungi, amoebae, and viruses are the prime cause for these diseases. These microorganisms settle in the cornea, grow, and feed on the cornea. This process causes a corneal ulceration. Contact lenses are the leading way these microorganisms enter the cornea (discussed later).
There contains multiple symptoms in order to identify corneal ulceration. Some of these symptoms include the following: eye redness, tearing increases, vision impairs, eye burning, itching, and photophobia (sensitive to light) start to develop (Medlineplus). Many different methods of detecting corneal ulcer are present at the doctor's office. Visual acuity test, Slit-lamp test, and Shirmers (tear) test are some of the tests that a doctor conducts during eye examination. Visual acuity test allows the doctor to measure a person's vision by reading the eye chart (figure 6). A Slit-lamp is a specialized magnifying microscope in which a doctor could examine the cornea, iris, and