Quantification of Metamorphopsia Using Hyperacuity Techniques

Quantification of metamorphopsia in patients with epiretinal membranes before and after surgery

“…Thus, a reproducible quantification of metamorphopsia was able to be performed in 98 patients (94%). The mean duration of the SLO test was 5±1 minutes (3)(4)(5)(6)(7)(8)(9)(10)(11); there was no significant difference in duration between the first and second sessions.…”

“…However, a possible learning effect cannot be excluded, as the patient was not re-examined with the Amsler grid after the SLO procedure was performed. Several authors have validated the quantification of visual distortion in patients with retinal diseases [4,5,8,17]. Shinoda [17] analysed the drawings performed by the patient.…”

“…However, fixation monitoring, precise localisation and quantification of metamorphopsia is limited with this technique. Several methods of improved assessment have been developed [4,5,[7][8][9]17]. Among the different approaches, scanning laser ophthalmoscopy (SLO) generated Amsler grid enables fixation monitoring, precise retinal localisation of metamorphopsia and its confrontation with retinal lesions [10,16].…”

Correlations between M-CHARTS and PHP Findings and Subjective Perception of Metamorphopsia in Patients with Macular Diseases

“…[1][2][3][4][5][6] Amsler's Chart has been widely used as a conventional method 7 to detect metamorphopsia. However, it cannot quantify the severity of metamorphopsia.…”

Vernier acuity and aging

“…Hyperacuity stimuli are highly resistant to image degradation and for this reason alone are of clinical importance as a test of visual function in patients exhibiting optically degraded or partially opaque media or scattering bodies [35][36][37][38][39][40] (see reference [38] for a general review of clinical applications). For clinical applications, use of a method of adjustment is preferred since in a clinical situation, especially one con- sisting of older patients, fatigue frequently becomes the most significant source of error.…”