Altering the pattern of panretinal photocoagulation: Could the visual field for driving be preserved?
Altering the pattern of panretinal photocoagulation: Could the visual field for driving be preserved?
复制标题
改变全视网膜光凝模式：能否保留驾驶视野？
作者：
N. Davies
目的确定视网膜的区域需要提供的视野驾驶和调查是否可以改变模式的全视网膜光凝（PRP）的增殖性糖尿病视网膜病变，以避免在这方面的治疗，同时留下的烧伤constant.Methods的总数正视眼的数学模型来计算视网膜的尺寸对应于不同的视野角度。这些用于定义对应于UK DVLC视野标准的视网膜区域和位于该区域之外的区域。进一步的计算估计在这些区域内应用的激光烧伤的数量为500 μm？结果PRP正常模式下应用的烧伤次数模型与控制增殖性视网膜病变所需的烧伤次数一致。减少烧伤间距或延长治疗锯齿缘允许应用足够的烧伤，以控制疾病，而不侵犯的视网膜，提供了drivingfield.Conclusion的地区，理论上是可能的，以改变PRP的模式，以避免在视网膜领域的治疗有关的驾驶视野，同时留下烧伤的总数恒定。这表明可以进行这种模式PRP的临床试验，以评估增殖性视网膜病变的充分控制以及驾驶所需视野的保留沿着。
Purpose To identify the area of retina required to provide the visual field for driving and to investigate whether the pattern of panretinal photocoagulation (PRP) for proliferative diabetic retinopathy could be altered to avoid treatment in this area whilst leaving the total number of burns constant.Methods A mathematical model of the emmetropic eye is used to calculate retinal dimensions corresponding to different angles of visual field. These are used to define retinal regions that correspond to the UK DVLC visual field criteria and regions that lie outside this area. Further calculation estimates the number of laser burns applied within these regions for both 500 μm? and 200 μm diameter spot sizes and various burn spacings.Results Modelling of the number of burns applied in the normal pattern of PRP agrees with the number required to control proliferative retinopathy. Reducing burn spacing or extending treatment up to the ora serrata allows application of sufficient burns to control the disease without encroaching on areas of the retina that provide the driving field.Conclusion It is theoretically possible to alter the pattern of PRP to avoid treatment in retinal areas concerned with the driving visual field whilst leaving the total number of burns constant. This suggests that a clinical trial of such a pattern PRP could be performed to assess adequate control of proliferative retinopathy along with preservation of the visual field required for driving.