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Medical Technology

Optical Coherence Tomography (OCT)

Optical Coherence Tomography (OCT)Optical Coherence Tomography (OCT) is a non-invasive imaging test that uses light waves to take cross-section pictures of your retina, the light-sensitive tissue lining the back of the eye. With OCT, each of the retina’s distinctive layers can be seen, allowing your eye doctor to map and measure their thickness. These measurements help with diagnosis and provide treatment guidance for glaucoma, and retinal diseases such as age-related macular degeneration and diabetic eye disease. 1

normal-retina

Humphrey Visual Field Analyzer

Humphrey Visual Field Analyzer is an instrument that maps out what your world looks like to you. It measures the area of vision, or how wide of an area your eye can see. The visual field shows changes that are not noticed by the patient until the damage is severe. The test consists of a center fixation light and blinking test lights in your side vision. It is important when taking this test that you concentrate on the fixation light in the center and press the button when the blinking test light is seen with your side vision. If you move your eyes to follow or look for the blinking lights, it decreases the reliability of the test and the ability of your doctor to monitor your disease. The visual field test is often performed to diagnose or monitor for glaucoma or other eye or neurological conditions. 6
Humphrey Visual Field Analyzer

IOL Master

IOL MasterIOL Master is the latest technology utilized by cataract surgeons. It uses laser technology to measure the length of the eye. Measuring the length of the eye accurately is extremely important in cataract surgery, as it allows the eye surgeon the select the right power lens implant for each patient. 3

Atlas Corneal Topography

Atlas Corneal TopographyAtlas Corneal Topography is a computer assisted diagnostic tool that creates a three-dimensional map of the surface curvature of the cornea. The cornea (the front window of the eye) is responsible for about 70 percent of the eye’s focusing power. An eye with normal vision has an evenly rounded cornea, but if the cornea is too flat, too steep, or unevenly curved, less than perfect vision results. The greatest advantage of corneal topography is its ability to detect irregular conditions invisible to most conventional testing. 2

Color Retinal Fundus Photography

Color Retinal Fundus PhotographyColor Retinal Fundus Photography uses a specialized low power microscope with an attached camera designed to photograph the interior surface of the eye, including the retina, retinal vasculature, optic disc, macula, and posterior pole (i.e . the fundus). The retina is imaged to document conditions such as diabetic retinopathy, macular edema, and retinal detachment. 4
retina

Heidelberg Retina Tomograph (HRT)

Heidelberg Retina Tomographretina2Heidelberg Retina Tomograph (HRT) uses a special laser to take 3-dimensional photographs of the optic nerve and the surrounding retina. The instrument takes pictures of many layers of the optic nerve and puts them together to create a 3-dimensional image of the entire optic nerve. The HRT is used by eye doctors to monitor the progression of glaucoma or other optic nerve disease. 5

References

1 Boyd, Kierstan. American Academy of Ophthalmology. 10.14.2014. http://www.aao.org/eye-health/treatments/what-is-optical-coherence-tomography
2 Corneal Topography. Memorial Eye Institute. http://www.memorialeye.com/corneal-topography/
3 Eye Physicians & Surgeons of Ontario. Cataract Testing. Canadian Ophthalmological Society. http://www.cos-sco.ca/vision-health-information/conditions-disorders-treatments/cataract/cataract-testing/
4 Faculty of Medicine. Color Fundus Photgraphy. Department of Ophthalmology and Visual Sciences. The University of British Columbia. http://ophthalmology.med.ubc.ca/patient-care/ophthalmic-photography/color-fundus-photography/
5 Henderer, Jeffrey. HRT: A Better Way of Examining the Optic Nerve in Glaucoma? Glaucoma Service Foundation to Prevent Blindness. 06.04.2016. http://willsglaucoma.org/the-hrt-a-better-way-of-exmaing-the-optic-nerve-in-glaucoma
6 Shaw. My Le and Cohen, John S. What Is a Visual Field Test? 05.05.2015. Glaucoma Research Foundation. http://www.glaucoma.org/treatment/what-is-a-visual-field-test.php