Please capitalize where necessary: only a thorough eye examination can diagnose the corneal diseases.
A: Only a thorough eye examination can diagnose the corneal diseases.

Please capitalize where necessary: in the case that your ppthtml file doesn't open, it is highly likely that you do not have the correct software application installed on your pc to view or edit ppthtml file extensions.
A: In the case that your PPTHTML file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit PPTHTML file extensions.

Please capitalize where necessary: and there were shepherds in the same country abiding in the field, and keeping watch by night over their flock.
A: And there were shepherds in the same country abiding in the field, and keeping watch by night over their flock.

Please capitalize where necessary: in a series of papers he introduced the concept now known as the 'schur multiplier'.
A:
In a series of papers he introduced the concept now known as the 'Schur multiplier'.