Secondly...
Secondly, it does not matter so much to frown at a blind man, because he cannot see. Moreover, 'Abdullah-ibn-Ummi-Maktum did not keep the rules of etiquette, since, he should not have interrupted the Prophet (p.b.u.h.) when he was busy talking to the people who were gathered there.
On the one hand, since Allah's emphasis is on love and affection for the poor and the afflicted, among the believers, it does not approve of the little amount of heedlessness from His prophet to that believing servant, so He admonishes him.
On the other hand, if we consider the Prophet (p.b.u.h.) as a true, great prophet, from these verses we see that they are almost a miracle, because the great leader of Islam mentions such important resposibilities in the heavenly Holy Book, about himself, that he finds the slightest 'leaving to the better' an option: i.e. the little amount of heedlessness to a blind truth-seeking believer, which Allah admonishes him for.
This is an evidence for the fact that this Book is from Allah and he is a true prophet, because if the Book were not from Allah surely it would not have such content. A more astonishing matter is that according to the above mentioned narration, whenever the Prophet (p.b.u.h.) saw 'Abdullah-ibn-Ummi-Maktum, he remembered the occasion and onored him very much.
The other aspect, which the verses contain, is that of the Islamic culture in relation to the behavior shown to the oppressed and to the arrogant: as to how it considers the blind, poor believer in comparison to those rich, powerful pagan Arab leaders. This clearly shows that Islam is a support for the oppressed and is against the arrogant.
In conclusion, we repeat that though the first thought about the occasion of this revelation is well-known among the commentators, it should be confessed that there is nothing vivid, in the verse, to prove the idea that the Prophet (p.b.u.h.) is the clear target of the admonition. Commentary: Harsh Admonition for Heedlessness Shown to a Truth-seeking Blind Man.
Keeping in mind what was said about the first idea regarding the occasion of revelation of the verses, we will now discuss the given commentary. He frowned and turned away. Because there came to him the blind man". And what would make you know that he might (spiritually) purify himself". Or become reminded so that the reminder might profit him? The reminder can be, at least, an advice to him.