Matt Valdes,Stanley Woo,Joshua Pratt,George C. Woo
美国圣道大学卢森堡视光学院(Matt Valdes);美国Marshall B. Ketchum大学南加州视光学院(Stanley Woo);美国华盛顿州双子港眼科中心(Joshua Pratt);香港理工大学视光学院(George C. Woo)
A pilot study investigating prismatic image relocation in subjects with bilateral central scotomas
Matt Valdes,Stanley Woo,Joshua Pratt,George C. Woo
Rosenberg School of Optometry, University of Incarnate Word, San Antonio 78229, USA(Matt Valdes); Southern California College of Optometry, Marshall B. Ketchum University, Fullerton 92831, USA(Stanley Woo); Twin Harbors Eye Center, Aberdeen 98520, USA(Joshua Pratt); School of Optometry, Hong Kong Polytechnic University Hong Kong, China(George C. Woo)
Objective In this study we used a scanning laser ophthalmoscope (SLO) to evaluate the oculomotor response to ophthalmic prisms in patients with bilateral central scotomas. Methods Six low vision patients with bilateral central scotomas and six normally sighted subjects were recruited. Nidek MP-1 microperimetry was performed to confirm an absolute central scotoma and identify the subject′s preferred retinal locus (PRL). A Rodenstock SLO captured real time images of the retina while projecting a target onto the previously identified PRL. A 6-8 prism diopter lens was then introduced while the subject was instructed to maintain fixation on the target. Retinal landmarks were used to measure the retinal image shift and subsequent refixation with the PRL. Average deviation and time (timestamp video) to refixate were calculated using ImageJ software. Results Refixation to the displaced target for the study group was within 3 pixels or 11.66 arc minutes (x axis: 2.90±3.92; y axis: 2.53±4.18). The control group refixated more accurately (x axis: 0.33±1.15; y axis: 0.89±2.50), but the amount was not statistically different from the AMD group (tx=1.32, Px>0.05 and ty=0.80, Py>0.05). Time to refixate demonstrated that the control group (0.98±0.19 s) was quicker than the AMD group (2.83±1.63 s) and the difference was statistically significant (t=5.03, P<0.01). One subject did not refixate. His data was excluded and analyzed individually. Conclusion With prismatic image relocation, patients with bilateral central scotomas refixate similar to normal subjects. However, time to refixate was significantly slower in the AMD group and one of the six subjects did not refixate. This data suggests patients with bilateral central scotomas are utilizing the same retinal location with and without the prism in place. Therefore, no benefit is achieved by image relocation.
Matt Valdes,Stanley Woo,Joshua Pratt,George C. Woo. 使用棱镜重新定位双侧中心暗点患者视网膜物象的预实验[J]. 中华眼视光学与视觉科学杂志, 2016, 18(10): 613-618.
Matt Valdes,Stanley Woo,Joshua Pratt,George C. Woo. A pilot study investigating prismatic image relocation in subjects with bilateral central scotomas. Chinese Journal of Optometry Ophthalmology and Visual science, 2016, 18(10): 613-618. DOI: DOI:10.3760/cma.j.issn.1674-845X.2016.10.008
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