Szlyk J P, Seiple W, Laderman D J, Kelsch R, Ho K, McMahon T
Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago Eye Center, University of Illinois at Chicago College of Medicine, 60612, USA.
Optom Vis Sci. 1998 Jul;75(7):518-24. doi: 10.1097/00006324-199807000-00021.
To test the effectiveness of a bioptic form of a peripheral vision-enhancement lens in patients with retinitis pigmentosa (RP), choroideremia, and Usher's syndrome Type II.
Fifteen patients with peripheral visual field loss were trained in the use of the amorphic lenses for driving and other everyday activities for a 3-month period. A cross-over study design was used, where one group of eight patients received training during the first 3 months of the 6-month study, and another group of seven patients received training during the second 3 months. All patients were administered a battery of clinical, psychophysical, functional, mobility, and driving assessment tests at the beginning of the study, at 3 months, and at 6 months. The assessment tests were coded according to the primary visual skill involved in the task. These visual skills included: recognition, peripheral detection, scanning, tracking, visual memory, and mobility.
After training, the patients showed improvement in all visual skills categories on the assessment tests, with overall improvement of 37%. There was no significant difference in the levels of improvement between the two groups. Those with smaller visual field extents showed significantly greater improvement on peripheral detection and scanning tasks. Those patients trained during the first 3 months of the study maintained their skills when tested at the 6-month point.
Patients with peripheral vision loss may benefit from a rehabilitation program which combines low vision training with amorphic lenses in a bioptic configuration.
测试一种用于增强周边视力的双光透镜对患有色素性视网膜炎（RP）、脉络膜缺损和II型Usher综合征患者的有效性。
15名周边视野丧失的患者接受了为期3个月的使用非球面透镜进行驾驶和其他日常活动的培训。采用交叉研究设计，一组8名患者在6个月研究的前3个月接受培训，另一组7名患者在第二个3个月接受培训。所有患者在研究开始时、3个月时和6个月时都接受了一系列临床、心理物理、功能、活动能力和驾驶评估测试。评估测试根据任务中涉及的主要视觉技能进行编码。这些视觉技能包括：识别、周边检测、扫描、跟踪、视觉记忆和活动能力。
训练后，患者在评估测试中的所有视觉技能类别均有改善，总体改善率为37%。两组之间的改善水平没有显著差异。视野范围较小的患者在周边检测和扫描任务上的改善明显更大。在研究前3个月接受训练的患者在6个月测试时保持了他们的技能。
周边视力丧失的患者可能会从一个将低视力训练与非球面透镜双光配置相结合的康复计划中受益。
