<prompt> If the refractive power of the unaccommodated eye of an emmetropic woman is 60 diopters D, the axial length of her eye is closest to?14.5mm15.5mm16.5mm17.5mm  <response>: The focal point of an optical system in meters is the reciprocal of the refractive power of the system. Therefore, the focal point is 160 diopter D, or 16.7 mm. An emmetropic eye forms a focused image of a distant object on the retina without accommodation. If the axial length is 16.5 mm, the image will be focused on the retina. Ref: Chang D.F. 2011. Chapter 2. Ophthalmologic Examination. In P. Riordan-Eva, E.T. Cunningham, Jr. Eds, Vaughan Asburys General Ophthalmology, 18e. 