The interpretation timeline
Mark 8:24 Douay-Rheims

And looking up, he said: I see men as it were trees, walking.

A.D. 735 – 1863 7 witnesses 8 excerpts

Patristic

before A.D. 750
735
A.D.
Bede the Venerable Patristic
c. A.D. 672–735
“(ubi sup.) Seeing indeed the shapes of bodies amongst the shadows, but unable to distinguish the outlines of the limbs, from the continued darkness of his sight; just as trees standing thick together are wont to appear to men who see them from afar, or by the dim light of the night, so that it cannot easily be known whether they be trees or men.”
Source
“(ubi sup.) Or else, putting spittle into the eyes of the blind man, he lays His hands upon him that he may see, because He has wiped away the blindness of the human race both by invisible gifts, and by the Sacrament of His assumed humanity; for the spittle, proceeding from the Head, points out the grace of the Holy Ghost. But though by one word He could cure the man wholly and all at once, still He cures him by degrees, that He may shew the greatness of the blindness of man, which can hardly, and only as it were step by step, be restored to light; and He exhibits to us His grace, by which He furthers each step towards perfection. Again, whoever is weighed down by a blindness of such long continuance, that he is unable to distinguish between good and evil, sees as it were men like trees walking, because he sees the deeds of the multitude without the light of discretion.”
Source

Reformation

c. 1500 – 1650
1637
A.D.
1567–1637
“And looking up , he said 9 1 see men as it were trees 9 walking. As much as to say, I see something obscurely and confusedly; for I see men walking, but in such a way that I cannot distinguish whether they are men or trees. Just as it happens to ourselves, says Bede; when we see people at a great distance, we can only distinguish men from trees by their motion, because men walk, but trees do not. The word walking must be referred to men, not to trees, as is plain by the Greek. The word walking in the Latin text, however, might refer to trees in this sense : I see men as it were trees split, and therefore two-footed, GIVING SIGHT TO THE BLIND. 41$ and so walking. This blind man, therefore, as yet in darkness, saw men as it were through a mist and cloud, in which they appeared greater than they really were, it might be as thick and tall as trees, as by means of magnifying glasses letters appear larger than they are in reality. It is related of S. Gregory Thaumaturgus, that in the Decian persecution he fled with his deacon to a certain hilL A certain traitor made known where they were to the persecutors, who carefully searched the whole hill to discover Gregory. With strong faith in God, he stood in prayer, with eyes immovable and hands stretched out But God smote the persecutors with inability to see. They returned and reported that they had seen nothing on the hill except two trees a little distant from one another. When they had gone away, the traitor himself went up the hill and saw two men, Gregory and his deacon, instead of the trees. He acknowledged that it was the work of Divine power that they had appeared to the persecutors to be trees, and he fell down at their feet, and from a traitor became a confessor of the faith. (S. Greg. Nyss. in Vita.) Mystically: The Scholiast in S. Jerome says, “The blind man 4 is a penitent sinner. He sees men as trees walking, because he esteems every one superior to himself. With David he counts himself unworthy to be called a man, deeming himself to be a dead dog and a flea” (2 Sam. xvi.)”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And he looked up,.... This is omitted in the Arabic and Persic versions. The sense is, that he opened his eyelids, and lifted up his eyes, to try if he could see, and he could, and did see again; his sight was returned again, though very imperfectly as yet: and said, I see men, as trees, walking: he saw some objects at a little distance from him, which, by their motion, he supposed to be men; otherwise his sight was so imperfect, that he could not have distinguished them from trees: he was capable of discerning the bulk of their bodies, and that they walked, or moved forward; but he could not distinguish the particular parts of their bodies; they seemed to be like trunks of trees, in an erect posture, and which he should have took for such, had it not been for their walking. As this man immediately, upon Christ's putting spittle on his eyes, and laying his hands on him, had sight given him, though it was very obscure and glimmering; so, as soon as ever the Gospel comes with power, it dispels the darkness of the mind, and introduces light; though at first it is but very small; it is let in gradually: the sinner is first convinced of the evil of his actions, and then of the sinfulness of his nature; he first sees the ability and suitableness of Christ as a Saviour, and after that his willingness, and his interest in him as such; and all this is commonly before he is so well acquainted with the dignity and infiniteness of his person, as the Son of God: and it is some time before he has his spiritual senses exercised to discern between good and evil, between truth and error; or arrives to a clear and distinct knowledge of Gospel truths, and a stability in them. Hence it is, that such are greatly harassed with Satan's temptations; are disquieted in their souls; are filled with doubts and fears, and are in danger of being imposed upon by false teachers.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“I see men as trees, walking - His sight was so imperfect that he could not distinguish between men and trees, only by the motion of the former.”
1849
A.D.
1774–1849
“Men [1] as trees walking. In the Latin text, walking may agree either with men, or with trees, but the Greek shews that walking must be referred to men. Perhaps Christ restored sight in this manner to the man by degrees, to make him more sensible of the benefit; or to teach us how difficult is a sinner’s conversion; of which this was a figure. (Witham)”
Source
1863
A.D.
1796–1863
“The men as seen by him resembled trees in height, but were distin- guished by their walking.”

Undated

date unknown
date
unknown
“(Vict. Ant. e Cat. in Marc.) He spat indeed, and put His hand upon the blind man, because He wished to shew that wonderful are the effects of the Divine word added to action; for the hand is the symbol of working, but the spittle, of the word proceeding out of the mouth. Again He asked him whether he could see any thing, which He had not done in the case of any whom He had healed, thus shewing that by the weak faith of those who brought him, and of the blind man himself, his eyes could not altogether be opened. Wherefore there follows: And he looked up, and said, I see men as trees walking; because he was still under the influence of unfaithfulness, he said that he saw men obscurely.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.