A Clinical Assessment and Management of a Patient with Facultative Hyperopia
A CLINICAL ASSESSMENT AND MANAGEMENT OF A PATIENT WITH FACULTATIVE HYPEROPIA
Prepared By:
Santos, Clarence O.
Abstract Ametropia is an anomaly of the refractive state of the eye in which, with relaxed accommodation, the image of objects at infinity is not formed on the retina. Thus vision may be blurred. The ametropias are: astigmatism, hyperopia (hypermetropia) and myopia. The absence of ametropia is called emmetropia.The word "ametropia" can be used interchangeably with "refractive error" or "image formation defects." Types of ametropia include myopia, hyperopia and astigmatism. They are frequently categorized as spherical errors and cylindrical errors. Those who possess mild amounts of refractive error may elect to leave the condition uncorrected, particularly if the patient is asymptomatic. For those who are symptomatic, glasses, contact lenses, refractive surgery, or a combination of the three are typically used.
Keywords
Hyperopia, Ametropia, Facultative Hyperopia
Introduction
Hyperopia, also known as farsightedness, longsightedness or hypermetropia, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its optical power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred. The causes of hyperopia are typically genetic and involve an eye that is too short or a cornea that is too flat, so that images focus at a point behind the retina.In severe cases of hyperopia from birth, the brain has difficulty merging the images that each individual eye sees. This is because the images the brain receives from each eye are always blurred. A child with severe hyperopia has never seen objects in detail
Prepared By:
Santos, Clarence O.
Abstract Ametropia is an anomaly of the refractive state of the eye in which, with relaxed accommodation, the image of objects at infinity is not formed on the retina. Thus vision may be blurred. The ametropias are: astigmatism, hyperopia (hypermetropia) and myopia. The absence of ametropia is called emmetropia.The word "ametropia" can be used interchangeably with "refractive error" or "image formation defects." Types of ametropia include myopia, hyperopia and astigmatism. They are frequently categorized as spherical errors and cylindrical errors. Those who possess mild amounts of refractive error may elect to leave the condition uncorrected, particularly if the patient is asymptomatic. For those who are symptomatic, glasses, contact lenses, refractive surgery, or a combination of the three are typically used.
Keywords
Hyperopia, Ametropia, Facultative Hyperopia
Introduction
Hyperopia, also known as farsightedness, longsightedness or hypermetropia, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its optical power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred. The causes of hyperopia are typically genetic and involve an eye that is too short or a cornea that is too flat, so that images focus at a point behind the retina.In severe cases of hyperopia from birth, the brain has difficulty merging the images that each individual eye sees. This is because the images the brain receives from each eye are always blurred. A child with severe hyperopia has never seen objects in detail
References: American Optometric Association. Optometric Clinical Practice Guideline: Care of the patient with hyperopia. 1997. "Eye Health: Presbyopia and Your Eyes." WebMD.com. October, 2005. Accessed September 21, 2006. Chou B. "Refractive Error and Presbyopia." Refractive Source.com Accessed September 20, 2006. American Optometric Association. Optometric Clinical Practice Guideline: Care of the patient with presbyopia. 1998. Kazuo Tsubota, Brian S. Boxer Wacher, Dimitri T. Azar, and Douglas D. Koch, editors, , Hyperopia and Presbyopia, New York: Marcel Decker, 2003 Roque, B. Refractive errors in children. November 2, 2005. "Frequently Asked Questions: How do you measure refractive errors?". The New York Eye And Ear Infirmary. Retrieved 2006-09-13.