Irregular shaped pupil

[Thechickentrainer1999]

I have an almost 3 year old buff orpington hen who's left eye has all of a sudden changed. She acts normal, looks overall healthy but I'm not sure why it has changed. The pupil is slightly irregular shaped while the eye is a lighter color. The other eye is completely normal. She's lived with the same flock with no new added chickens for a year. What do you think it is?
Affected eye:

Non affected eye:

 

[Thechickentrainer1999]

Does anyone have a clue?

 

[DobieLover]

Does anyone have a clue?

What is the iris color around the left pupil? It's difficult to see in the picture.

 

[Thechickentrainer1999]

What is the iris color around the left pupil? It's difficult to see in the picture.

I'm color blind but all I know is it is slightly a lighter color. Maybe I can get some closer up pictures today.

 

[chelseachook]

My hen has this. It is like she only has half a pupil. It has been 2 years since I noticed it and she has been fine. I still don't know what it is but she doesn't seem to have any vision loss.

 

[Eggcessive]

Sometimes Mareks disease (ocular type) can cause the iris to become paler and grey, change the shape of the pupil, which can cause pinpoint pupil. The eye color in the right side looks pale as well. Does she seem to be able to see to get around and if you place a bowl of her favorite treat in front of her?

 

[dawg53]

I agree with Eggcessive, probably ocular Marek's disease.

 

[Thechickentrainer1999]

Sometimes Mareks disease (ocular type) can cause the iris to become paler and grey, change the shape of the pupil, which can cause pinpoint pupil. The eye color in the right side looks pale as well. Does she seem to be able to see to get around and if you place a bowl of her favorite treat in front of her?

She seems to see perfectly fine with that eye though. Also I thought mareks disease showed in both eyes.

 

[Thechickentrainer1999]

Are there any other problems besides mareks which can effect the eye/s?

 

[Thechickentrainer1999]

If this was ocular mareks, would she need to be removed from the others because I sure hope not?