Turtledoves are perhaps most famous for their place in what has become a slightly obnoxious Christmas song: "On the first day of Christmas, my true love sent to me..." Outside of this song, turtledoves are known for two things:
- they mate for life (thus you almost always find them in pairs) and
- they have no peripheral vision
Those two realities are connected. Successful mating for life requires a certain tunnel vision.
My own eye condition helps me understand this. A couple decades ago I was diagnosed with keratoconus, a degenerative eye disease that makes your cornea resemble a cone, making everything appear blurry. It has gotten so advanced in my left eye that an ophthalmologist told me I don’t really use my left eye. My brain basically relies on my right eye.
It's not a big deal, except when I'm biking or running. Then I have to completely turn my head to see over my left shoulder, but most people live with worse medical maladies than this. There have been a few embarrassing moments, like when I applied for a new driver’s license and was asked to read the letters in the "middle" column.
I could only see two columns, and there's no "middle" in two.
"Is there something wrong with you?" my tester asked.
How long did she have?