Anisometropia: The condition in which the two eyes have unequal refractive power. One eye may be myopic (nearsighted) and the other hyperopic (farsighted) or one eye may be markedly stronger than the other.
Anisometropia is a serious concern in newborns and young children because it can lead to amblyopia (impaired vision in one eye). With a major degree of anisometropia, the brain cannot reconcile the difference in images coming from the two eyes. It develops a preference for the image coming from one eye and suppresses the image from the other eye and, in time, the brain loses the ability to “see” the image from the suppressed eye.
Anisometropia is derived from Greek and made up of four parts: an-, -iso-, -metr-, and -opia. Their meaning (in parentheses) is simple. An- (not) + -iso- (equal) + -metr- (measure) + -opia (vision). Literally, the measure of vision is not equal. The refractive power of the two eyes is different. The opposite of anisotropia is isometropia. In isometropia, the refractive power is equal in both eyes.
Ankle: The ankle joint is complex. It is made up of two joints: the true ankle joint and the subtalar joint: The true ankle joint is composed of 3 bones: the tibia which forms the medial (inside) portion of the ankle; the fibula which forms the lateral (outside) portion of the ankle; and the talus […]
- Ankle bone
Ankle bone: The ankle bone is termed the talus. It is the bone of the foot that joins the tibia and fibula to form the ankle joint. Plural tali.
- Ankle joint
Ankle joint: A joint that is composed of three bones: the tibia, the fibula, and the talus. The ankle joint is responsible for the up-and-down motion of the foot. The subtalar joint is under the ankle joint, and it consists of the talus on top and calcaneus on the bottom. The subtalar joint is responsible […]
- Ankle pain
Achilles tendonitis; Ankle sprain.
- Ankle sprain
Ankle sprain: A common musculoskeletal injury in which the ligaments of the ankle partially or completely tear due to sudden stretching. This typically occurs when the ankle is suddenly “twisted” in a sports activity or by stepping off an uneven surface. The pain is initially severe and can be associated with a “popping” sensation. Immediate […]