September 19th, 2019 | Updated on March 3rd, 2020
When was the last time you visited your ophthalmologist? Have you ever wondered why there are so many different pieces of equipment used during an eye examination?
Here is a list of some of the equipment used during exams and how they work.
- Phoropter – It is used to measure refractive errors and to determine the prescriptions of the eyeglasses.
- Retinal Camera – It is used to photograph the back of the eye and of the retina. It works to document any eye diseases. When taking a picture, it produces a bright flash.
- Auto Refractor – This machine is used to measure a person’s refractive error and prescription for eyeglasses and or contact lenses. The automated refraction technique is very simple and most of all, painless.
- Tonometer – During the exam, the pressure of the eye should be measured with this equipment. With this test, a person can be detected if he or she has Glaucoma. There are 2 types of Tonometer, first is the one that uses numbing drops if it is designed to touch the eye, and the other one does not need numbing drops which is called air-puff tonometer.
- Binocular Indirect Ophthalmoscope – It is used to examine the interior structures of the eye especially the retina, which consists of a mirror that reflects lights into the eye and a central hole through which the eye is examined. This equipment is being worn at the doctor’s head so he/she can use both of his/her hands to examine the eyes.
- Lensometer – It is used to measure the power of an existing lens. It will be used to determine the prescription of a patient’s eye glasses.
- Slit Lamp – It is a microscope with an attached light which helps the doctor to closely examine the patient’s eye. With this instrument, the structures of cornea, iris and lens become visible. There is also a slit lamp with special lenses that can examine even at the back of an eye.
- Retinoscope and Direct Ophthalmoscope – In order to observe the reflection of the retina, a light to shine a patient’s eye from a retinoscope will be used. The light will be moved freely across the pupil. It is very useful in prescribing corrective lenses for patients who are unable to give oral feedbacks to the doctor. It is also useful in determining how both eyes are working together.
- Manual Keratometer – It is used when determining how flat or steep the cornea is. It is also widely used in diagnosis of astigmatism, corneal scarring, corneal distortion and keratoconus. It is also commonly used when fitting contact lenses.
According to studies, human eyes are very intricate in terms of function. It has numerous nerves and elements connected and directly affects our eyesight. If any of those element is missing or is out of place, we immediately feel its effect and most likely, we lose our sense of sight.
These equipment are designed perfectly for our eyes. These are the reasons why taking eye tests would sometimes cost us a great amount of money, but these equipment are vital to keep our eyes healthy.
It may sound complex, but that’s what it is. As we grow old or be stricken by a disease at a young age, eyes problems may occur. But through the effort of the experts in this field, maintaining a good eyesight becomes possible and achievable.
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