Flash Fiction Contest - Ambiguous Ending (1st place)

The prompt:

There's an art to the open-ended-ending that denies you closure, but somehow still feels like the right ending. I want to read shorts that will make me raise my fist in the air and say "OMG I hate you for leaving me hanging like that!" judges the winner.

Refraction

The ophthalmologist is busy turning dials and flipping discs. He looks at his patient with his hand on his chin and his head tilted sideways. His patient gazes back unfazed. Dr. Deracs feels her hot breath on his face.

"I'm not sure the instruments are working properly. "

He focuses the beam on the back of her eye and there it is again. A glowing orange dot. At first, it seems to be an odd refraction of the light, but it is blinking at regular intervals.

He leans back and flicks the lights on in the room. He wipes moist palms on the tops of his thighs. Turning to the patient's mother he says, "Uh, is there something you aren't telling me?"

A slow and eerie smile tilts the edges of her lips.

"Alexa, turn out the lights."