How an ophthalmologist’s exam may head off serious risks.

A gray, tear-shaped translucent cloud partially blocked vision in the left eye of a 63-year-old New York man we’ll call Syd. At first, he passed it off to fatigue or too much time in front of a computer screen. When the cloud began to feel like a permanent patch over his field of vision, he went to an ophthalmologist.

After eye drops had widened Syd’s pupils, the physician used a piercingly bright light to illuminate Syd’s retina, the transparent surface at the back of the eye where images are projected. Within a minute, the doctor spotted a problem unrelated to the cloud. …

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