When it comes to a spot metering your subject, you will have to do it right in order to make the light meters work correctly. The light meters in your camera are capable of reading an entire scene and metering a specific area depending on the way you focus. Modern day cameras are capable of offering the spot metering based on the actual focus point.
When it comes to spot metering, in general, you may not like to meter for the subject’s eyes thinking that it would cause an awkward exposure. As a replacement for this strategy, most of the photographers try meter for the subject’s clothing or skin. If you intend to do so, you should better do a manual metering.
You can simply meter for the clothing or the skin of the subject and then focus on his or her eyes. This will eliminate the potential possibilities of overexposed eyes. However, advanced systems might facilitate you to focus directly on the eye of the subject and meter it manually. After which, the camera itself will focus on the subject’s eye automatically.