Perceptual visual distortions in amblyopia and their stability over time M Piano1, A Simmers1, P Bex2, S Jeon1 |
|---|
1Visual Neuroscience Group, Glasgow Caledonian University, United Kingdom |
| It is well-established that amblyopes experience metamorphopsia (spatial visual distortions) (Lagreze and Sireteanu, 1991, Vision Research, 31, 1271-1288). Metamorphopsia measured with subjective sketches and shape reconstruction tasks is highly repeatable. However, its long term stability is unknown. We examined the pattern and severity of monocular and dichoptic amblyopic metamorphopsia, to determine stability one week and one month after initial assessment. 6 adult amblyopes and 3 age-matched controls had visual acuity and binocular vision assessments. At each visit, monocular metamorphopsia was measured 4 times in each eye (computerised square-reconstruction task), and dichoptic metamorphopsia 5 times binocularly (mouse-based target-clicking task on a stereoscopic LCD monitor, using active shutter glasses). Controls had no significant metamorphopsia – this did not change over time (dichoptic, p = 0.074; monocular, p = 0.920). Amblyopes showed metamorphopsia compared to controls (dichoptic, p < 0.001; amblyopic eye, p = 0.005), but no significant change in dichoptic (p = 0.786) or monocular (amblyopic eye, p = 0.061) metamorphopsia over time. Our method measured binocular and monocular metamorphopsia in amblyopic participants and demonstrated that pattern/severity was stable over one month. This consistent metamorphopsia exists in treated and untreated amblyopes and could potentially influence the outcomes of existing and emerging amblyopia treatments. |
| Up Home |
|---|