Quantitative visual fields under binocular viewing conditions in primary and consecutive divergent strabismus
Quantitative visual fields under binocular viewing conditions in primary and consecutive divergent strabismus
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DOI：
10.1007/s004170050276
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发表时间：
1999-07-01
影响因子：
2.7
通讯作者：
de Jong, PTVM
中科院分区：
文献类型：
--
作者：
Joosse, MV;Simonsz, HJ;de Jong, PTVM
背景：虽然已经有许多关于发散性斜视抑制暗点大小的研究，但尚未有关于该暗点的完整范围（即大小和深度）的报道。方法：采用双眼静态视野检查法对5例原发性发散斜视患者和10例连续发散斜视患者进行抑制暗点测量。该研究还包括四名对照受试者。使用两台改进的弗里德曼视野分析仪，我们测量了单眼和双眼观察条件下双眼的视野。斜视的客观角度为3°～25°。双眼最佳矫正视力至少为 0.4，但大多数为 1.0。结果：所有受试者在单眼观察条件下每只眼睛都有正常的视野。在这 15 名受试者中，有 12 名受试者在双眼观察条件下发现了大面积的抑制，包括注视点的投影以及非注视眼睛的中央凹的投影。在这 12 名患者中，有 2 名患者（一名患有原发性斜视，一名患有连续发散性斜视），抑制区域位于鼻侧至非注视眼视野中中央凹的位置（鼻半抑制）。在另外两名患有发散性斜视并伴有垂直偏差的患者中，发现了一个小的注视点抑制暗点。抑制深度范围为 3 dB 至 16 dB。仅在一名受试者中未发现抑制。结论：我们的研究结果表明抑制暗点的形状与发散性斜视的起源或斜视的角度无关。我们的研究结果还表明，发散性斜视发生抑制的关键年龄可能长达 14 岁。
Background: Although there have been a number of studies on the size of the suppression scotoma in divergent strabismus, there have been no reports on the full extent (i.e. size as well as depth) of this scotoma. Methods: Binocular static perimetry was used to measure suppression scotomas in five patients with primary divergent strabismus and ten patients with consecutive divergent strabismus. Four control subjects were also included in the study. With two modified Friedmann visual field analysers, we measured the visual field of both eyes under monocular and binocular viewing conditions. The objective angle of squint ranged from 3 degrees to 25 degrees. Best corrected visual acuity was at least 0.4, but mostly 1.0 in both eyes. Results: All subjects had normal visual fields for each eye under monocular viewing conditions. In 12 of the 15 subjects, we found a large area of suppression encompassing the projection of the fixation point as well as that of the fovea in the non-fixating eye under binocular viewing conditions. In 2 of these 12 patients, one with primary and one with consecutive divergent strabismus, the area of suppression was located nasally to the postion of the fovea in the field of the non-fixating eye (nasal hemisuppression). In another two patients with divergent squint combined with vertical deviation, a small fixation-point suppression scotoma was found. The depth of suppression ranged from 3 dB to 16 dB. In one subject only, no suppression was found.Conclusions: Our findings indicate that the shape of the suppression scotoma is not related to the origin of divergent strabismus or to the angle of squint. Our results also indicate that the critical age for the development of suppression in divergent squint might be up to 14 years.