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Peter H Derr, Alberto Gonzalez-Garcia, Anna Shengelia, Jason L Chien, Mark Ghassibi, Celso Tello, Robert Ritch; Reference Ranges for Fixed Protocol Short Duration Transient Visual Evoked Potentials Parameter of Healthy Eyes. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):461.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the responses of Fixed Protocol Short Duration Transient Visual Evoked Potentials (SD-tVEP) on healthy subjects, to obtain the distribution of these parameters, and to establish expected reference ranges.
95 healthy eyes were randomly selected (95 subjects). Inclusion criteria was: best corrected visual acuity 20/30 or better, spherical refraction within ±5.00 D, cylinder correction within ±3.00 D, normal Standard Automated Perimetry, normal slit lamp biomicroscopy, intraocular pressure ≤22 mmHg , normal stereoscopic disk photos, normal retinal nerve fiber layer thickness by optic coherence tomography, normal dilated fundus examination. SD-tVEP’s were recorded using the Diopsys NOVA System . Each eye was stimulated with a 15% (Lc) and 85% (Hc) Michelson contrast checkerboard pattern. Test duration was 30 seconds/eye and each test resulted in a low and high contrast response . Each response’s P100 latency and N75-P100 amplitude was evaluated. Reference ranges were calculated: Lc Amplitude, Lc Latency, Hc Amplitude and Hc Latency. The reference ranges were validated for normal distribution of the residuals (Observed values - Predicted values) across the entire age range and for three equal sized subgroups based on age.
Study population demographics were: 45.3% male; 54.7% female; 75.8% Caucasian; 2.1% African American; 17.9% Hispanic; and 4.2% Asian. The age range was 21 to 81 years old. Table 1 is the SD-tVEP parameter age adjusted reference ranges with ±95% CI.
SD-tVEP low and high contrast fixed protocol reference ranges with (-/95%CI) will provide the clinician the ability to compare a patient’s SD-tVEP results to an age adjusted mean value with upper and lower limits.
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