Harold Brock, Mississippi prisoner #R5226, appeals the summary-judgment dismissal of his 42 U.S.C. § 1983 lawsuit asserting that prison officials were deliberately indifferent to his serious medical needs when they placed him, against his medical restrictions, in a bottom bunk, which caused him to repeatedly hit his head on the top bunk, resulting in bumps and bruises and loss of vision. “This court reviews the grant of a summary judgment motion de novo, using the same criteria used by the district court.” Fraire v. City of Arlington, 957 F.2d 1268, 1273 (5th Cir. 1992).

Summary judgment was proper in this case because the undisputed evidence shows that Brock did not sustain any injury resulting from the claimed constitutional violation. See Memphis Community School Dist. v. Stachura, 477 U.S. 299, 308-09, 106 S.Ct. 2537, 91 L.Ed.2d 249 (1986). The summary-judgment evidence, including Brock’s own pleadings and testimony at the Spears hearing, show that his loss of vision was not caused by any head trauma and that he never required any medical attention when he bumped his head on the upper bunk. Brock has thus failed to show any cognizable injury resulting from the alleged particular act of deliberate indifference, and his claim fails. See id.

Brock argues that the district court erred in considering Dr. Richardson’s affidavit for the proposition that his loss of vision did not result from head trauma because the affidavit was untimely and because Dr. Richardson was not qualified as an expert. As noted above, Brock’s *432 own evidence, specifically, the letter from Dr. Richardson which he attached to his complaint, contained the same information as Dr. Richardson’s affidavit. The affidavit was thus duplicative of Brock’s evidence and the district court’s consideration of it, even if error, was harmless. Brock’s conclusional allegation that head trauma could equally have caused his loss of vision does not meet his burden to show a genuine issue of material fact. See Little v. Liquid Air Corp., 37 F.3d 1069, 1075 (5th Cir. 1994) (en banc). His reliance on the affidavits he submitted from other inmates for the proposition that his blindness resulted from head injuries is misplaced because none of the inmate affidavits so state.

The district court’s judgment is AFFIRMED.