What is the primary purpose of A-scan biometry in ophthalmology?

The primary purpose of A-scan biometry in ophthalmology is indeed for intraocular lens (IOL) calculations. A-scan biometry provides precise measurements of the eye's axial length, which is crucial when determining the correct power of the IOL required for patients undergoing cataract surgery or refractive lens exchange. By measuring these dimensions accurately, ophthalmologists can ensure that the implanted lens will provide optimal vision correction for the patient, taking into account their unique eye anatomy.

While measuring intraocular pressure is important for diagnosing conditions like glaucoma, it is done through different methods such as tonometry. Assessing visual acuity is a separate evaluation of the patient's eyesight and not directly related to A-scan biometry. Similarly, while A-scan may contribute to an overall assessment of eye health, its main focus is not for general disease diagnostics but rather for calculating the appropriate IOL power based on eye measurements. Therefore, the statement about its primary purpose aligns perfectly with its use in clinical practice for setting up effective cataract surgeries.