American Academy of Ophthalmology (2007). Refractive Errors and Refractive Surgery (Preferred Practice Pattern). San Francisco: American Academy of Ophthalmology. Also available online: http://one.aao.org/CE/PracticeGuidelines/PPP.aspx.
Donahue SP (2009). Presbyopia and loss of accommodation. In M Yanoff, JS Duker, eds., Ophthalmology, 3rd ed., pp. 1059–1060. Edinburgh: Mosby Elsevier.
Riordan-Eva P (2008). Presbyopia section of Optics and refraction. In P Riordan-Eva, JP Whitcher, eds., Vaughan and Asbury's General Ophthalmology, 17th ed., pp. 387–388. New York: McGraw-Hill.
Trobe JD (2006). Refractive disorders section of Principal ophthalmic conditions. In Physician's Guide to Eye Care, 3rd ed, pp. 121–124. San Francisco: American Academy of Ophthalmology.