Diagnostic Tests

The doctors at First Eye Care Downtown Dallas have a wide variety of advanced equipment available to perform tests to evaluate the health and wellness of your eyes. The is a list of the most common tests with a short description of each.

Snellen Chart

• Visual Acuity Testing
• The Snellen Chart (the chart with the big E at the top) is used to test each eye for visual acuity or “sharpness” at a distance. A smaller, hand-held chart is used to test short vision.
• Fundus Photography
• A special non-invasive examination technique in which photographs are made of the internal structures of the eye.
• Corneal Topography
• An examination technique that allows us to analyze the physical features and shape of the anterior surface of the cornea.
• Retinal Scanning Lasers
• A procedure that uses a low-energy laser to image the structure of the retinal layers and optic nerve.
• Slit Lamp Testing
• This piece of vision testing equipment combines a simple chin rest with a light source that produces a “slit” of light that’s used to scan your eye. Your doctor (with the help of special viewing lenses) can look into the internal structure of your eye to potentially diagnose a host of eye problems and diseases.
• Phoropters
• Phoropters are machines that allow your eyecare professional to “switch” lenses during your exam to see if your focus is better, or worse.
• External Ocular Photography
• A non-invasive procedure in which photographs are used to document conditions of the external structures of the eye.
• Specular Microscopy
• A special photographic technique that is used to evaluate the structure and function of the corneal endothelium, the single layer of cells on the inner surface of the cornea.
• Refraction
• A test that determines the optical power of the eye and measures the combined function of the retina, optic nerve and visual pathways in the brain.
• B-Scan Ophthalmic Ultrasound
  A non-invasive diagnostic procedure that uses ultrasound to create a two-dimensional image of the interior structures of the eye.
• Visual Field Examination
• A test that measures the combined function of the retina, optic nerve and visual pathways in the brain.
• Visual Evoked Potential Testing
  A neurophysiologic test that measures the combined function of the retina, optic nerve and visual pathways in the brain
• Optomap Retinal Exam
• OPTOS laser imaging technology is used for the early detection of retinal disease.
• RAPDx Expanded Pupil Examination
  RAPDx is a new diagnostic instrument that identifies relative afferent pupillary defects.
• Anterior Segment Imaging
• A non-invasive procedure that uses a low-powered laser to image the cornea, iris and anterior chamber of the eye.
• Extended Ophthalmoscopy
• An ophthalmoscopy technique that is used when a detailed examination of the retina is required.
• Corneal Pachymetry
• Corneal pachymetry is the measurement of corneal thickness.
• The “Puffer” Test
• A light is beamed into your eye while a gentle puff of air is blown across the eye’s surface. A special machine measures the resistance of the eye to the puff of air, and then calculates internal eye pressure.

To schedule an appointment with Dr. Roger Weikum, please call (972) 313-9505.