Diagnosis of Glaucoma

Diagnosis of Glaucoma

The best way to maintain your eye health and preserve your vision is to have regular and complete eye examinations with the appropriate level of diagnostic testing for Glaucoma as recommended by Dr. Whitaker. During your examination, Dr. Whitaker and the staff may perform a number of tests in order to make the most accurate diagnosis of Glaucoma. These include the following testing procedures:


The Tonometry Test is a method of measuring your Intraocular Pressure (IOP). This test involves first placing some eye drops into your eyes to numb them and then lightly touching the surface of the Cornea with a specialized measuring instrument. There is no discomfort involved. The test is quick and gives Dr. Whitaker the first piece of important information in determining whether you have Glaucoma.


Ophthalmoscopy is a method of carefully examining the inside of the eye-especially the optic nerve-in order to detect Glaucoma. Some eye drops will be placed in your eyes in order to dilate your pupils so that Dr. Whitaker can make a clear and direct observation of the optic nerve. The examination will take place in a darkened room using different types of Ophthalmoscopes in order to examine the shape and color of your optic nerve.

If either your Intraocular Pressure (IOP) is elevated or your optic nerve appears unusual, additional tests will be necessary in order to complete the Glaucoma examination. These may include the following test procedures:

Visual Field Perimetry

Perimetry or Visual Field testing is an important part of the Glaucoma examination. During this test you will be asked to sit in front of a large “bowl like” instrument and look directly straight ahead. A computer program will present a number of lights in different positions of your “side” or peripheral vision to see how sensitive your side vision is in various directions. The computer will then plot an actual map of your field of vision so that Dr. Whitaker can interpret this map in conjunction with other examination tests in order to understand how well your optic nerve is functioning. Glaucoma usually affects your side vision before your central vision, so visual field testing can often show any problems from glaucoma before you can notice them.


Gonioscopy is a quick and painless test that allows Dr. Whitaker to directly observe the health and condition of the angle where the Iris meets the Cornea. By directly observing the angle and its status Dr. Whitaker will be know more about whether you are at risk for the angle to become closed or whether the Trabecular Meshwork appears to have a normal anatomical structure.

Optic Nerve Computer Imaging

At Riverside Eye Center, Dr. Whitaker uses the most advanced computer imaging technology in order to make the earliest and most accurate diagnosis of Glaucoma. Our Optic Nerve Computer Imaging system is called OCT or Ocular Coherence Tomography. The OCT uses a method called “optical coherence tomography” that is capable of creating digital images through the use of special beams of light in order to create a contour map of the optic nerve and measure the retinal nerve fiber thickness. In many regards this is similar to the CT Scans used to study organ systems and tissues throughout your body. 

The goal of OCT Optic Nerve Computer Imaging is to give Dr. Whitaker the ability to detect the slightest loss of optic nerve fibers, at the first possible moment, in order to diagnose Glaucoma at the earliest possible stage in order to stop the progression of the disease and preserve your vision.

We perform OCT Optic Nerve Computer Imaging right in the comfort and convenience of our office at Riverside Eye Center.

Pachymetry Measurement of Corneal Thickness

The National Eye Institute of the National Institutes of Health released a key study in 2002, called the Ocular Hypertension Study (OHTS) (http://www.nei.nih.gov/glaucomaeyedrops/). In this study an important finding was made regarding corneal thickness and its role in Intraocular Pressure and the development of Glaucoma.

The OHTS study found that corneal thickness is important because it can alter the accuracy of the measurement of Intraocular Pressure, potentially causing doctors to treat you for a condition that may not actually exist or to treat you unnecessarily when you are normal. Your actual Intraocular Pressure may be UNDERESTIMATED if you have thin corneas and it may be OVERESTIMATED if you have thicker corneas.

During your Glaucoma examination, Dr. Whitaker or a staff member may perform a Pachymetry Test to measure your corneal thickness as part of your examination and consider this finding in conjunction with the other Glaucoma testing in order to make the most accurate diagnosis.

The Pachymetry Test is a simple, quick and painless way of accurately measuring your corneal thickness that we do right in our office. The test is performed by first placing some drops in your eyes to make them numb and then lightly touching the cornea with a “pencil like” probe that uses sound waves to precisely measure your corneal thickness.

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