A heartwarming YouTube video shows a formerly blind Irish Terrier named Duffy as he greets his human family for the first time after having his sight restored.

According to Benjamin May, who posted the video, Duffy is a rescue dog who lost his eyesight after developing diabetes. After medication and surgery at the Veterinary Referral Center in Malvern, Pennsylvania, Duffy was able to see again.

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The video shows Duffy seeing some of his family members for the first time in months.

* Originally published in July 2014.