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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Doc Ophthalmol. 2010 Mar 27;121(1):29–35. doi: 10.1007/s10633-010-9228-z

Fig. 1.

Fig. 1

Sample results from a 14 year old subject with a history of mild ROP and t50 value (10 s) close to the ROP median. Rod isolated ERG a-wave responses are shown in the left panel; the responses to the single flash and to the probe flash at the indicated inter-stimulus intervals (ISI) are shown. In the right panel, a-wave amplitude (R) expressed as a proportion of the response to the single flash (RMAX) is plotted as a function of ISI. The ISI (arrow) that would produce a half maximum response was determined by linear interpolation.