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Photon has energy, and delivers that energy to the retina of your eye, and that is why you see the light. Only thing is, that energy is not that much as baseball.
It does not hit the lens, though.. it passes through it (and it is not so simple because the photon is also a wave, that is why it deflects a little and that is why the lens focuses light).
As far as mass of the photon is concerned, they have zero rest mass.. but because of that they can travel at light speed, and the energy they carry could be of any value, including the energy of the baseball at 150km/h. Such photons, though, would be VERY energetic, and they would have wavelengths close to something like gamma rays or even shorter.. I should sit down and take calculator in my hand to give you the exact value.
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