Your dad may have high cholesterol
I am African-American and i have this kind of eye to but i see perfectly fine but Google said it is like cheltoral.(im ten i cant spell that great)
FOLLOW THIS LINK FOR A PICTURE OF ARCUS OF CORNEA
http://www.mastereyeassociates.com/eye-care-news-blog/whats-that-ring-around-my-eye
From Wikipedia.com
Arcus senilis (or arcus senilis corneae) is a white, grey, or blue opaque ring in the corneal margin (peripheral corneal opacity), or white ring in front of the periphery of the iris. It is present at birth, but then fades; however, it is quite commonly present in the elderly.
I too have a blue ring around my iris and the whites of my eyes are sometimes bluish. My eyes are dark brown. (hemotogenic) I have had this all my life. My mother never had this as she constantly commented on how blue the whites of my eyes were and have even shown up in a photo as blue. I am a 40yr old olive skinned woman. However through research women with olive complexion or darker skin and darker hair etc... have thicker blood than Caucasian types and apparently this blue ring is related to the blood and our deep ancestry roots. I have 4 children and only my first born has this too.
I'm of Puerto Rican and Spaniard ancestry. My eyes were hazel but turned light brown when i was 8 years old. I've had the blue circle my whole life as i have gotten older the blue circle it's more noticeable. I recently had a physical and do not have high cholesterol.