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A refraction test is typically done during a routine exam. A refrecation test is used to determine your exact perscription for the lenses you might be using.
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Refraction tests can entail many things, such as whether you need a perscription and if so what is the exact perscription. Along with this the test also lets one know what eye conditions they may have, such as astigmaticm, and or Macular degeneration.
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Visual Acutiy tests examine your ability to see certain things from a distance, such as letters and numbers. They are often used when one is experiencing change in their vision, or difficulty seeing, however, one is also likely to take a Visual Acutiy test at a young age or age of development, in order to ensure that the eye is developing correctly.
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As a fraction, visual acutiy is represented by the number 20/20. Your visual acuity at a distance of 20 feet from an object is considered normal. However , if you have 20/40 vision, it would entail that you would need to be 20 feet away in order to notice an object that most people can see from 40 feet away.
Slit lamps help diagnose nuemerous conditions, such as but not limited to macular degeneration, and cataracts. A normal test result entails a healthy eye, however, an abnormal test result may be the result of many different conditions, such as but not limited to inflimmation, or increase in eye pressure, which can be the product of certain conditions.
Slit lamps are used to look for issues in the eye, they do this by enabiling the physican to look closely at your eyes. During a slit lamp examination, you will place your head on an instrument in front of you, as to rest it. From there eye drops will be dropped into your eye, and a slit lamp will be used to make any abnormalities more visible, as it is an intense light.
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To manually calculate "refraction," or how precisely a lens must be formed and curved to restore your vision to normal, is how a phoropter is utilized. Based on this one can determine the curve of the lense you may need.
The phoropter is typically only used after a serious of tests and other devices have already been used or done. The phoropter helps determine whether or not one has an issue with their eyes. It does this by switching through different lenses to determine which might best suit the person.
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Tonometry is used to analyze the intraocular pressure (the pressure in the eye), through this analyzation it can be determined as to whether or not one has Gluacoma. It entails gently pressing a flat-tipped probe across the surface of your eye.
A normal result of this test indicated that the eye has a normal pressure, and it is likely that glaucoma is not present, and there are no other condition in which your eye pressure is affecting your eye, meaning your eye is healthy.
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References
Griff, A. M. (n.d.). Refraction Test: Overview, Purpose & Procedure. Healthline. Retrieved February 15, 2023, from https://www.healthline.com/health/refraction-test
Griff, A. M. (n.d.). Visual Acuity Test: Purpose, Procedure, and Results. Healthline. Retrieved February 15, 2023, from https://www.healthline.com/health/visual-acuity-test
Griff, A. M., & Diaz, V. (n.d.). Tonometry: Purpose, Procedure, and Results. Healthline. Retrieved February 13, 2023, from https://www.healthline.com/health/tonometry
Learn About Eye Exams: Equipment Used During an Exam. (n.d.). Eyeglass World. Retrieved February 13, 2023, from https://www.eyeglassworld.com/eye-vision-patient-education/eye-exams/equipment-used-during-an-eye-exam
Phoropter | What Is A Phoropter. (n.d.). EyeGlass Guide. Retrieved February 14, 2023, from https://www.eyeglassguide.com/my-visit/vision-testing/phoropter.aspx
What the Heck is a Phoropter? | Kansas City Eye Doctors. (2019, March 22). Eye Associates. Retrieved February 14, 2023, from https://www.seetheclarity.com/blog/what-is-a-phoropter.html