 So, this is an 18-month-old boy who at birth developed infantile spasms and was noted to have unilateral hemimegalencephaly, which is an enlargement of one cerebral hemisphere. He had a left hemispherectomy, but despite this he had persistent seizures. After a vagal nerve stimulator and starting the ketogenic diet, this helped, but he still has about 20 seizures per day, which is better than about 100 that he was having before. His mother had a normal pregnancy, normal ultrasounds, no known infections during pregnancy, and he was born full term. There's no family history of seizures, no neurodevelopmental or genetic diseases that run in the family. And his developmental history, as you would expect, he's developmentally delayed. He's able to sit with support. He can throw objects, and he likes toys that have lighted buttons. He can't say any words, but does communicate his likes and dislikes with sounds. This is a list of the medications that he's on. As you can see, he's on Sabral or by Gabbatron, and we'll be talking more about that. Because of his use of Sabral, it was recommended that he get eye exams. Unfortunately, the first exam that he got was just VEP and ERG without an EUA. So the first time that we're seeing him is in April of 2018. In the clinic, he has wandering eye movements and XT. And then for his EUA, his pressure is 712, and this is a cycloplegic retinoscopy. And so as I said, in 2017, he had a VEP and ERG without the associated EUA. So we do have a comparison point. And you can see that his P100 amplitude is slightly better back in 2017, but this wasn't under endosesia, so probably pretty comparable. And this is single flash ERG, and you can see that he has decreased EUA of amplitude. And this is 30 hertz testing the cones, and he has a very poor cone response bilaterally, as he did back in 2017.