Noticed odd eye color in my silkie chick—could it be Ocular Marek’s disease?

[franciemayhem]

Hello all, it’s my first time posting on here! I’m relatively new to keeping backyard chickens, and right now I have two five-week old silkie chicks. I noticed that my white silkie, Spark, has odd coloring in both of her (or his) eyes. The other chick in the brooder has ‘normal’ eyes. I’m wondering if Spark has segmented heterochromia, or Ocular marek’s disease or maybe something else entirely. If the general opinion is that it’s Marek’s, should I vaccinate the rest of my flock (I have not introduced the chicks to my other eleven week old Buff Orpington pullets) just in case? Also, not sure if this is relevant, but Spark has a lot of energy and is always knocking over trays of food, distress calling if temp is slightly off or food level is low (while the other chicks are content), and is just generally pretty chaotic. She’s good with being handled, though. I attached some pictures of her eyes, any advice would be appreciated!!