What is the primary use for A-scan biometry?

The primary use for A-scan biometry is related to IOL (intraocular lens) calculations. A-scan biometry is a method used in ophthalmology to measure the length of the eyeball, specifically from the front (cornea) to the back (retina). This measurement is crucial in determining the appropriate power of the intraocular lens that will be implanted during cataract surgery or other vision-correcting procedures. Accurate IOL power calculation is essential to achieve optimal visual outcomes for patients undergoing these surgeries.

While corneal mapping is vital for understanding the shape and quality of the cornea, it does not directly involve A-scan biometry. Assessing glaucoma involves different tests such as measuring intraocular pressure or checking the optic nerve, rather than incorporating A-scan measurements. Retinal imaging, which focuses on capturing images of the interior surface of the eye, is unrelated to the measurement of axial length for lens calculation. Therefore, A-scan biometry's primary focus and application lie in IOL calculations, making this the correct response.