<unk>  (PHP) is a psychophysical test used to identify and quantify visual abnormalities such as metamorphopsia and scotoma. It is a type of<unk> .
Preferential hyperacuity perimetry
Scanning laser ophthalmoscopy
Eye testing using speckle
Retinal birefringence scanning
Humphrey visual field analyser
Scanning laser polarimetry
Vernier acuity
Doppler optical coherence tomography