Visual Electrophysiology

Electrical testing of vision’, so called ‘visual electrophysiology’, is a measurement of the very small signals generated by the eye and the brain in response to what we see or look at. They give information regarding the eye, nerve and brain function that helps the doctor make decisions on diagnosis and treatment.

Why Would I Be Referred for Electrophysiology Testing?

The main reasons for referral are:

• To confirm or exclude a suspected diagnosis
• Unknown diagnosis
• To determine the characteristics and severity of disease
• To monitor the disease before and after treatment

What Should I Expect?

You can expect to take a series of tests including Electroretinogram (ERG), Pattern Electroretinogram (PERG), and Visual Evoked Potential (VEP) tests.

For more information, view brochure here.

It can take up to three hours to complete all the tests, but they are all non-invasive, and it is rarely necessary to use numbing drops in the eye. There are no injections into the eye or arm. The drops used to dilate the pupils may cause a slight stinging sensation for a few seconds and vision will be blurred for a few of hours after testing so driving during that time should be refrained. Dark glasses may help on a sunny day. Patients having a VEP will usually wash their hair when they get home.

The tests will be carried out by Clinical Physiology Technicians. The results will be interpreted by a Consultant Electrophysiologist. A report will be sent to the doctor who referred the patient.

For further information regarding the department or the tests, please contact us at +65 6908 2222 or email:eye_surgery@nuhs.edu.sg

Low Vision

Patients with low vision may be referred to our Low Vision Enabling Programme.