This is Will, I’ll take that. From the market perspective, let's talk about that first. We did conduct some market research with an outside firm. We talked about this a little bit in the last call, but I would like to go back to it again. First of all, we are looking at treating -- if you look at the -- if you look at the feasibility study and the way the inclusion criteria/exclusion criteria is written, we can basically treat any type of blindness as long as it's not currently treatable by a commercial product. So, in that case, it would exclude RP patients treated by Argus and also it can't be blindness caused by trauma to the visual cortex. But other than that we're open to treat patients. So, when we did our market research, we basically identified four major buckets of patients to look at those were glaucoma, sorry, people blind from glaucoma, blind from diabetic retinopathy, blind from optic nerve disease or damage to the optic nerve and then blind from eye trauma or eye injury. And when you combine those four buckets, you end up in the U.S. with about 500,000 patients who are legally blind from those four buckets or four causes of blindness. We then further looked at the patient population and try to refine it to a number that was actual number of patients that could be treated given what are expected indications for use would be. So we tried to eliminate patients that would be too sick for surgery, too many other complications, and then, we also reduced the level of vision from legally blind down to bare-light or no-light perception. So, when we do that, we end up with a patient population of about 70,000. And again that compares to the same research that said RP population is close to 1,500 patients. And to be very clear again, these numbers are only US numbers, so we confined it to the U.S. So, again, about 70,000 patients in the U.S. compared to an RP population of 1,500 and then we expect if you look at Western Europe, the population would be similar, it actually would be somewhat larger in Western Europe when you consider a larger population there. So, a very, very large population of patients for us there, John. And then let me address the question also concerning the FDA and our discussions there. As everyone probably noticed, we are in active discussions and we haven't reached an agreement or a final agreement with them, so we can't really say with certainty what the trial will look like, but I can certainly make some comments. First of all we know that we're going to need to demonstrate a certain level of visual acuity or visual function with Orion and we also know that we will have some measure of a quality of life improvement in the study. And those endpoints would all be somewhat similar to what we did with Argus. In Argus, we also had to have visual acuity, visual function measurements as well as a quality of life tool to measure changes in their quality of life. So, similar type measurements there to what we experienced with Argus. As far as the number of patients, I would say you should be thinking that it would be at least 30 patients in a pivotal, it could be more, but certainly I’d say 30 is the floor, and the follow up would be at least 6 months. So, again, these are kind of the floor numbers for number of patients and follow up. And then, there were also as a part of this breakthrough technology program, you get to move some of the data collection into the post market setting, so there will be a defined agree to post market trial as well. Again, we don't know the number, but I think you should assume that one will be more than -- more than 30. So may be a final word, you know, we are breaking some new ground here. So, before we finalize these measurements and these numbers with the FDA, we really want to understand the Orion performance much better and that's why we've said we're going to, you know, give it to the end of the year, early next year to really understand what we think the Orion performance will be and then move forward with our discussions with the FDA and try to finalize a trial design. And then, once we do that, we have committed as soon as we're comfortable that we have agreement with the FDA, then that's something that we would have course want to share with investors or potential investors. Hopefully that answers your question, John.