Tunnel Vision Prismatic Field Expansion: Challenges and Requirements
Tunnel Vision Prismatic Field Expansion: Challenges and Requirements
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DOI：
10.1167/tvst.4.6.8
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发表时间：
2015-11-01
影响因子：
3
通讯作者：
Peli, Eli
中科院分区：
文献类型：
--
作者：
Apfelbaum, Henry;Peli, Eli
目的：没有棱镜解决方案的周边场损失（PFL）已获得广泛接受。棱镜扩展的光场在棱镜顶点处存在相应的光学暗点。当每只眼睛被给予不同的视野时（通过视觉混乱），可以实现真正的扩展。我们分析了在不同的设计，以确定限制任何解决方案，可能会满足acceptance.Methods：计算视野图进行了比较，PFL患者佩戴InWave通道棱镜和Trifield眼镜的视野。知觉图说明双眼视觉混乱。结果：通道棱镜提供没有好处，在主注视。InWave棱镜提供了无关紧要的延伸，尽管可以通过适度的凝视转移来实现。高功率棱镜提供更大的延伸，伴随着更大的旁中心暗点损失，但需要不舒服的注视转移。需要头部转动，而不是眼睛扫描，才能看到顶端暗点丢失的区域。三视野棱镜提供领域扩大在所有的目光位置，但接受是有限的干扰效果的中央双眼visual confussion.Conclusions：领域扩大时，在主要的目光（大部分时间是花），同时仍然提供通畅的中央视觉。我们正在开发的旁中心多路复用棱镜，可以通过平移和透视来实现这一点。
Purpose: No prismatic solution for peripheral field loss (PFL) has gained widespread acceptance. Field extended by prisms has a corresponding optical scotoma at the prism apices. True expansion can be achieved when each eye is given a different view (through visual confusion). We analyze the effects of apical scotomas and binocular visual confusion in different designs to identify constraints on any solution that is likely to meet acceptance.Methods: Calculated perimetry diagrams were compared to perimetry with PFL patients wearing InWave channel prisms and Trifield spectacles. Percept diagrams illustrate the binocular visual confusion.Results: Channel prisms provide no benefit at primary gaze. Inconsequential extension was provided by InWave prisms, although accessible with moderate gaze shifts. Higher-power prisms provide greater extension, with greater paracentral scotoma loss, but require uncomfortable gaze shifts. Head turns, not eye scans, are needed to see regions lost to the apical scotomas. Trifield prisms provide field expansion at all gaze positions, but acceptance was limited by disturbing effects of central binocular visual confusion.Conclusions: Field expansion when at primary gaze (where most time is spent) is needed while still providing unobstructed central vision. Paracentral multiplexing prisms we are developing that superimpose shifted and see-through views may accomplish that.