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Advanced Technology

Dr. Diaz in Brownsville, TX uses cutting-edge technology to assess your eyes. Many eye diseases, if detected at an early stage, can be treated successfully without total loss of vision.


phoropter woman smileThe phoropter, is advanced technology used to measure a patient’s glasses prescription, strength of the focusing system, alignment of the eyes and muscle balance between the two eyes.

By having you look through the phoropter at a visual reference, image, or the “Big E” chart (the Snellen chart), our Brownsville eye doctor will help guide you toward lenses that correct your vision impairment by switching lenses within the machine on the fly.

Auto Refractor/Keratometer

Auto RefractorThe Auto refractor/ keratometer takes an automated measurement of your refractive error. This gives the doctor a starting point for your prescription. It also measures the shape of your cornea which is used for fitting contact lenses.

The accuracy of this combined instrument allows us to have a viable starting point in determining your glasses and contact lens prescription. The keratometer is also useful in determining the health and integrity of the cornea in conditions such as Keratoconus.


Digital Lensmeter

 Digital Lensmeter - eye exam brownsvilleIf you bring your glasses to the exam will we read them on a machine called a lensmeter. This will tell us what prescription you have been wearing so our doctors can compare it to your new prescription and how much change there has been and if you need new glasses. Unlike many eye care practitioners, it is important to note that our doctors are completely separate and make no profit whatsoever from the sale of glasses. Therefore, there is no incentive for our Brownsville eye doctor to recommend you get new glasses when you really do not need to!

Visual Field Testing

A visual field test measures the range of your peripheral or “side” vision to assess whether you have any blind spots (scotomas), peripheral vision loss or visual field abnormalities. It is a straightforward and painless test that does not involve eye drops but does involve the patient’s ability to understand and follow instructions.

An initial visual field screening can be carried out by our Brownsville optometrist by asking you to keep your gaze fixed on a central object, covering one eye and having you describe what you see at the periphery of your field of view. For a more comprehensive assessment, special equipment might be used to test your visual field. In one such test, you place your chin on a chin rest and look ahead. Lights are flashed on, and you have to press a button whenever you see the light. The lights are bright or dim at different stages of the test. Some of the flashes are purely to check you are concentrating. Each eye is tested separately and the entire test takes 15-45 minutes. These machines can create a computerized map out your visual field to identify if and where you have any deficiencies.

Dr. Diaz provides comprehensive eye examinations, including exams for eyeglasses, contact lenses, and eye health testing for glaucoma and cataracts.

Call (956) 200-2020 Request Appointment Online