Morphision: A method for subjective evaluation of metamorphopsia in patients with unilateral macular pathology (i.e., full thickness macular hole and epiretinal membrane)
| Autor: | Marta Ugarte, Manoharan Shunmugam, D Alistair H Laidlaw, Tom H Williamson |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Anterior segment parameter
pars plana vitrectomy pentacam silicone oil injection Astigmatism cataract surgery toric lens toric intraocular lens Amblyopia anisometropia occlusion recurrence visual acuity Cortical visual impairment flash visual evoked potentials periventricular leucomalacia stimulation frequency in visual evoked potentials visual evoked potentials Cytomegalovirus retinitis cytomegalovirus retinitis retinal detachment cytomegalovirus highly active antiretroviral therapy Incidence postnatal weight gain retinopathy of prematurity risk factors weight gain proportion Nasal incision surgically induced astigmatism temporal incision Mantoux test serpiginous choroiditis tuberculosis Distortion epiretinal membrane macular hole metamorphopsia morphision Ophthalmology RE1-994 |
| Zdroj: | Indian Journal of Ophthalmology, Vol 61, Iss 11, Pp 653-658 (2013) |
| Druh dokumentu: | article |
| ISSN: | 0301-4738 1998-3689 |
| DOI: | 10.4103/0301-4738.117804 |
| Popis: | Background: Lack of clinical tests to quantify spatial components of distortion in patients with full thickness macular holes (FTMH) and epiretinal membranes (ERM). Aim: To develop a test for subjective evaluation of visual distortion in the central visual field around fixation in patients with unilateral FTMH or ERM. Settings and Design: Prospective case-control study carried out at tertiary referral center. Materials and Methods: Twenty-five patients with unilateral macular disease (13 macular epiretinal membranes, 12 full-thickness macular holes), and nine controls (without ocular pathology) underwent ophthalmological examination with logMAR ETDRS visual acuity, near vision and contrast sensitivity assessed. Macular optical coherence tomography and metamorphopsia assessment using Morphision test was also carried out. This test consists of a set of modified Amsler charts for detection, identification, and subjective quantification of visual distortion in the central visual field around fixation. Morphision test content and construct validity, and reliability (test-retest method) were evaluated. Sixteen patients completed an unstructured survey on test performance and preference. Results: Every patient with unilateral FTMH or ERM identified a particular chart using Morphision test (content validity). None of the normal subjects without symptoms of metamorphopsia identified any distortion (construct validity). Test-retest showed a 100% consistency for frequency and 67% for amplitude. The mean amplitude difference between measurements was 0.02 degrees (SD = 0.038). The coefficient of repeatability was 0.075. There was a correlation between Morphision amplitude score and visual acuity and contrast sensitivity, individually. Conclusions: Morphision test allowed detection and subjective quantification of metamorphopsia in the clinical setting in our patients with unilateral macular epiretinal membranes and full thickness macular holes. |
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