Landers J, Sharma A, Goldberg I, Graham S
Eye Associates, Park House, Sydney, NSW 2000, Australia.
Br J Ophthalmol. 2006 Jan;90(1):70-4. doi: 10.1136/bjo.2005.071266.
Traquair described the topography of visual field sensitivity as a "hill" or "island" of vision. Achromatic automated perimetry (AAP) demonstrates this shape of the visual field in photopic conditions. Techniques claimed to target the magnocellular pathway (frequency doubling perimetry, FDP) and those using a stimulus targeting the koniocellular pathway (short wavelength (or blue on yellow) automated perimetry, SWAP), might produce one that is different. The authors compared the visual field topography from FDP with those of SWAP and AAP, to investigate whether there were significant differences in their shape.
A sample of 51 patients with previously confirmed normal perimetry were recruited; either low risk glaucoma suspects or normal controls. AAP, SWAP, and FDP perimetry was performed in random order on the same day. The topography of each field was analysed to determine its average shape and to compare results in the same individuals.
The topography of the visual field produced by each perimeter differed significantly. While all three had maximal sensitivity centrally, over the 24 degrees from the centre to the periphery, mean sensitivities decreased by 4.9 decibels (dB) for AAP and 7.3 dB for SWAP, while FDP sensitivities by just 1.8 dB over 20 degrees (the extent of the FDP field). FDP mean sensitivities decreased by approximately 0.3 dB with every 10 year increase in age, compared with 1 dB for AAP and 2 dB for SWAP.
While the topography of the SWAP (koniocellular) field is steeper than corresponding AAP fields, that of the FDP (magnocellular) visual field was considerably flatter. The difference in this shape may reflect retinotopic or cortical mechanisms, which are specific to the magnocellular pathways.
特拉夸尔将视野敏感度的地形图描述为视觉的“山丘”或“岛屿”。消色差自动视野计（AAP）在明视觉条件下展示了这种视野形状。声称针对大细胞通路的技术（频率加倍视野计，FDP）以及使用针对侏儒细胞通路的刺激的技术（短波长（或黄蓝）自动视野计，SWAP），可能会产生不同的视野形状。作者比较了FDP的视野地形图与SWAP和AAP的视野地形图，以研究它们的形状是否存在显著差异。
招募了51名先前经确认视野正常的患者样本；包括低风险青光眼可疑患者或正常对照。在同一天以随机顺序进行AAP、SWAP和FDP视野检查。分析每个视野的地形图以确定其平均形状，并比较同一受试者的结果。
每种视野计产生的视野地形图有显著差异。虽然三者在中心都具有最大敏感度，但从中心到周边的24度范围内，AAP的平均敏感度下降了4.9分贝（dB），SWAP下降了7.3 dB，而FDP在20度（FDP视野范围）内仅下降了1.8 dB。FDP的平均敏感度每增加10岁大约下降0.3 dB，而AAP为1 dB，SWAP为2 dB。
虽然SWAP（侏儒细胞）视野的地形图比相应的AAP视野更陡峭，但FDP（大细胞）视野的地形图则平坦得多。这种形状差异可能反映了特定于大细胞通路的视网膜拓扑或皮质机制。
