What do electro-oculogram (EOG) tests measure?
(ffERG)
The Electro-Oculogram (EOG) provides a measure of retinal function that depends upon the integrity of the retinal pigment epithelial layer. When this layer is healthy, a standing potential is established between the front and the back of the eye that responds to changes in background illumination. The standing potential in the eye is estimated by measuring the voltage induced across a pair of electrodes as the eye looks from side to side. This potential declines during dark adaptation to a minimum value and rises during light adaptation to a maximum value before returning to a steady equilibrium value. The ratio of the maximum amplitude under light adapted conditions divided by the minimum amplitude under dark adapted conditions is called the Arden ratio. The Arden ratio is the standard diagnostic measure of the EOG.
In FO, a minimum of six light/dark cycles are used. Each light or dark period lasts between 60 and 80 seconds and the rest period associated with standard EOG is eliminated to avoid missing peaks.
An effort is being made to standardize FO protocols for corollary purposes. Initial testing suggests that FO is an equally reliable measure to standard EOG.
Warning: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Substance Tables:
The table below lists substances which may be contained within LKC’s RETeval and RETevet products. Substances listed as Type 1 are within permissible levels in one or more of LKC’s products. Substances listed as Type 2 are used in the production of some components used in LKC products and may be present at trace levels, but are typically destroyed during processing.
RETeval and RETevet Devices
| Substance | CAS # | Type | Listed as causing: |
| Nickel | 7440-02-0 | 1 | Cancer |
| Acrylonitrile | 107-13-1 | 2 | |
| Ethylbenzine | 100-41-4 | 2 | |
| Crystaline Silica | 14808-60-7 | 1 | |
| Lead | 7439-92-1 | 1 | Cancer Developmental Toxicity Male Reproductive Toxicity Female Reproductive Toxicity |
| Methylene Chloride | 75-09-2 | 2 | Cancer Female Reproductive Toxicity |
| Bisphenol A | 80-05-7 | 2 | |
| N-Hexane | 110-54-3 | 2 | Male Reproductive Toxicity |