Research Article
Detecting the Physiological Blind Spot with Reaction Time Perimeter
| Laura Knaapi1,2, Eija Vesti2 and Markku T Leinonen3* | |
| 1Department of Ophthalmology, Satakunta Central Hospital, Pori, Finland | |
| 2Department of Ophthalmology, Turku University Hospital, Turku, Finland | |
| 3Ocuspecto Ltd, Turku, Finland | |
| Corresponding Author : | Markku T Leinonen, MD, PhD Ocuspecto Ltd Läntinen Pitkäkatu 17 B 2 20100 Turku, Finland Tel: +358 40 5283644 E-mail: [email protected] |
| Received: September 16, 2015; Accepted: November 13, 2015; Published: November 16, 2015 | |
| Citation: Knaapi L, Vesti E, Leinonen MT (2015) Detecting the Physiological Blind Spot with Reaction Time Perimeter. J Clin Exp Ophthalmol 6:493. doi:10.4172/2155-9570.1000493 | |
| Copyright: © 2015 Knaapi L et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | |
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| Peer-reviewed Full Article 
Abstract
Objective: To study the ability of a novel reaction time perimeter to detect a physiological blind spot. Methods: The location of the physiological blind spot of 11 healthy volunteers was determined with two independent methods, first by Octopus custom-made blind spot visual field program, and second by Fundus photography with a method previously described by the authors. With reaction time perimeter saccade triggering stimuli (STS) were shown in predetermined locations of the visual field in order to initiate saccades. An STS was followed by an FO (fixation object) i.e., an arrow head pointing either to the right or left at the same location as the previously shown STS. The recognition of the FO was reported by pressing a correct button (right or left respectively) thus verifying accurate fixation by the fovea. Time intervals between button presses were recorded. Reaction times for detecting the STS within the blind spot area were compared to those for detecting the STS in other locations of the visual field. Results: Reaction times within the blind spot area were longer compared to those in other locations in 10 of 11 subjects (Analysis of variance), p<0.001 in 9 subjects, p<0.006 in one subject). Conclusion: A physiological blind spot can be detected with reaction time perimeter.
