Illumination devices are described. In one embodiment, an illumination device includes a light configured to be coupled to eyewear or a mask, such as a surgical loupe or a dental loupe. The illumination device also includes a battery configured to be coupled to the light. The light and the battery may be connected by a light connector and a battery connector. The illumination device also includes a battery coupling device coupled to the battery. The battery coupling device may be configured to couple the battery to a body part of a user. For example, the battery coupling device may include arms that wrap around a back of a head of a user, and grip or hold the sides of a head of a user.