Why is the anterior chamber depth measured using ultrasound?

Measuring the anterior chamber depth with ultrasound is important for evaluating the risk for angle-closure glaucoma. In angle-closure glaucoma, the angle between the iris and cornea can become obstructed, leading to increased intraocular pressure. A shallow anterior chamber depth can indicate a narrow angle, making the eye more susceptible to sudden closure of the angle and, consequently, a higher risk for acute angle-closure glaucoma.

Ultrasound is particularly useful in this context because it provides an accurate assessment of the anterior chamber depth, especially in cases where visualization through conventional methods may be limited, such as in patients with cataracts or other opacities. By obtaining precise measurements, the healthcare provider can better predict the likelihood of angle closure and manage patient care accordingly.

The other options, such as assessing corneal curvature, determining lens opacity, or checking for retinal tears, involve different anatomical structures or pathologies that do not specifically relate to the assessment of the anterior chamber depth in the context of glaucoma risk.