Research by the College of Optometrists on Posterior Cortical Atrophy (PCA) has investigated the suitability of certain vision assessment tests to help differentiate between cortical and optical / ocular causes of visual impairment. An awareness of PCA helps to avoid choice of unsuitable tests and the potential risk of misdiagnosis. Certain tests, including the Amsler Grid and visual field analysis appear to be problematic for patients with PCA.
Bowen, M. Zutshi, H. [and] Cordiner, M. [et al] (2018). Qualitative, exploratory pilot study to investigate how people living with posterior cortical atrophy, their carers and clinicians experience tests used to assess vision. BMJ Open. March 20th 2019; 9(3): e020905.