The Commissioner of Social Security denied Cynthia Denton’s claim for disability *394insurance benefits. Because that decision is supported by substantial evidence and is in accordance with law, we affirm.
I.
Denton filed an application for disability insurance benefits in 2003, alleging numerous disabilities.1 The Commissioner denied her application.
An administrative law judge (“ALJ”) heard evidence from Denton, a medical expert, and a vocational expert. He considered Denton’s medical record and determined she was not disabled. When the Appeals Council denied Denton’s request for review, the ALJ’s decision became the Commissioner’s final decision for judicial review. Denton sued, and the matter was referred by consent to a magistrate judge, who, acting as the district court, upheld the ALJ.
II.
We review the Commissioner’s decision to deny social security benefits only to determine whether the final decision is supported by substantial evidence and whether the proper legal standards were used to evaluate the evidence. Brown v. Apfel, 192 F.3d 492, 498 (5th Cir.1999); Greenspan v. Shalala, 38 F.3d 232, 236 (5th Cir.1994). Denton urges that the ALJ’s determination is not supported by substantial evidence and that the ALJ applied improper legal standards.
Denton argues that the ALJ’s determination that Denton could perform work as an office helper, a mail clerk, and an assembler of small products is not supported by substantial evidence. Light work requires a good deal of walking and standing, but Denton asserts she cannot perform such work, because her knee pain precludes her from walking and standing. To buttress her argument, she contends that the district court found that the light work she could perform was limited by her inability to walk and stand. Denton states that “the only job the Court below found that would actually not be precluded would be that of a small parts assembler that would allow sitting through most of the work day.”
The record contains substantial evidence that Denton can walk, supporting the ALJ’s determination that she could perform work as an office helper, a mail clerk, and an assembler of small products. Dr. Barbara Felkins testified as a medical expert before the ALJ and opined, based on Denton’s medical history—including the various “orthopedic type complaints”—that Denton could perform light work. Felkins’s testimony provides substantial evidence for the ALJ’s conclusion that Den-ton could walk or stand for six hours in an eight hour day. Furthermore, the ALJ noted that Denton’s medical records did not evince significant problems walking, as demonstrated by the fact that she was never prescribed a cane despite her claim that she cannot walk because of imbalance.2
*395The district court’s opinion does not contradict this conclusion. The memorandum opinion and order states that small parts assembly is one example of work that Den-ton could perform, but the opinion does not say this is the only work she could perform.3
Denton complains that the ALJ committed legal error by not addressing whether she could sustain a job over time. Because her illnesses incapacitate her at various times, she urges, she could not keep a job even if she obtained one.
Contrary to Denton’s position, the ALJ did address her ability to sustain employment, thus applying the correct legal standard. The ALJ specifically found that Denton “could sustain the physical demands of light work,” and the ALJ noted that there was no evidence to establish that Denton “would be absent over two days a month or experience difficulties which would further interfere with full-time work.” These conclusions reflect consideration of whether Denton could sustain employment.
Denton protests that the ALJ did not properly evaluate the limitations imposed by her mental illness in assessing her residual functional capacity. Yet, the ALJ found that Denton does not have debilitating mental health impairment. Her impairments are only mild and were corrected through medication. The ALJ did not need to assess the limitations caused by Denton’s alleged mental health impairment because the ALJ found no such impairment existed.4
Finally, Denton states that the ALJ failed to evaluate the credibility of Den-ton’s testimony to the ALJ in light of other evidence. A review of the ALJ’s determination reveals Denton’s position is merit-less. The ALJ applied the proper legal standard, noting that he must consider “the extent to which [symptoms, including pain,] can reasonably be accepted as consistent with objective medical evidence____” The ALJ also considered the credibility of Denton’s testimony using “an evaluation of the intensity, persistence, and limiting effects of that pain.... ” The ALJ applied the proper legal standard to evaluate Denton’s testimony.
AFFIRMED.