![]() ![]() Colour vision testing using Ishihara plates helps. The large light is best if using mydriatic eye drops to dilate. This non-invasive test examines your fields of vision, and it is important for identifying vision problems that could be signs of eye disease or conditions that affect the brain (like a stroke). Clinical Ophthalmology Resource for Education. The patients visual field is compared with the GPs to assess for any abnormalities. Fundoscopic examination is a visualization of the retina using an ophthalmoscope to. OCT uses light waves to take cross-section pictures of your retina. Making Sense of Hypertensive Retinopathy. Our eye care team uses optical coherence tomography (OCT), a non-invasive imaging test. Also, the image quality numbers can alert you to a poor quality scan.1. Images with artifacts due to microsaccades have areas that appear “blacked out,” which can be identified on the printout. Many of the recent instruments come with this feature, but some of the earlier models did not. A visual field test measures your peripheral vision, or how well you can see above, below and to the sides of something you’re looking at. Likewise, the problem of microsaccades is avoidable if the OCT instrument has eye tracking and can confirm that the eye was being tracked during the measurements. The only certain way to avoid this problem is to own a machine that’s designed to compensate for this. The optometrist, or an assistant at the practice, takes a high-quality scan of the back of your eyes to see your retina in more detail. It is then confirmed using an OCT scan which can show up the swollen area of. Unfortunately, even an 8-degree tilt results in a major difference in the thickness reading. Macular oedema (MO) is swelling of the retina at the back of the eye in the. Elevated eye pressure can cause nerve fiber loss in the retina which may result in blindness or decreased vision. The former is an issue because a patient may put his head in one position during a scan and then put his head in a slightly different position at the next visit. Glaucoma is a disease in which eye pressure (intraocular pressure) can be elevated. Some instruments correct for these concerns, but others don’t. The two most common problems here are patient head tilt and micro-saccades. Electroretinography (ERG) is an eye test that detects function of the retina (the light-detecting portion of the eye). This is easily detectable on the posterior pole retinal thickness map and hemisphere asymmetry analysis (right). An example of “green disease.” Left: The retinal nerve fiber layer measurement of both eyes is labeled normal, but the small red arrow points to a focal loss of RNFL inferotemporally in the left eye. ![]()
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