Harle Deacon E, Davies Keri, Shah Rakhee, Hussain Syma, Cowling Susan, Panesar Tejinder K, Bourton Jonathan, Evans Bruce J W
The Neville Chappell Research Clinic, The Institute of Optometry, 56-62 Newington Causeway, London SE1 6DS, UK.
Ophthalmic Physiol Opt. 2007 Jan;27(1):100-5. doi: 10.1111/j.1475-1313.2006.00428.x.
Despite the current popularity of binocular indirect ophthalmoscopy, direct ophthalmoscopes are still commonly used by clinicians for fundus examination. They are considered to be expensive, however, and it has been suggested that this cost can prevent their use by healthcare professionals in developing countries. The Optyse Lens Free Ophthalmoscope is a novel direct ophthalmoscope, without a lens focus system, that allows for comparatively inexpensive manufacture and supply. We compared the clarity of view with the Optyse to that with standard direct ophthalmoscopes, over a sequential cohort of patients with a variety of refractive errors and ocular conditions. The grade of clarity of view with the Optyse Lens Free Ophthalmoscope was less than conventional ophthalmoscopes (Wilcoxon signed rank test, p < 0.0001). This grade of clarity of view was not associated with the ametropia of the ophthalmoscopic observation (Spearman r < or = 0.03, p > or = 0.28) but was with the presence of cataracts (chi2 test, p < 0.0001) with both the Optyse and the conventional ophthalmoscopes. Despite its limitations, the retinal view with Optyse was often within acceptable clinical limits suggesting that this relatively inexpensive ophthalmoscope may have a place when cost prohibits any other type of ophthalmoscope use.
尽管双目间接检眼镜目前很受欢迎，但直接检眼镜仍被临床医生广泛用于眼底检查。然而，它们被认为价格昂贵，有人认为这种成本可能会阻碍发展中国家的医疗保健专业人员使用它们。Optyse无透镜检眼镜是一种新型直接检眼镜，没有透镜聚焦系统，可实现相对廉价的制造和供应。我们在一系列患有各种屈光不正和眼部疾病的患者中，比较了使用Optyse检眼镜和标准直接检眼镜时的视野清晰度。使用Optyse无透镜检眼镜时的视野清晰度等级低于传统检眼镜（Wilcoxon符号秩检验，p < 0.0001）。这种视野清晰度等级与检眼镜观察的屈光不正无关（Spearman相关系数r ≤ 0.03，p ≥ 0.28），但与白内障的存在有关（卡方检验，p < 0.0001），无论是使用Optyse检眼镜还是传统检眼镜。尽管有其局限性，但使用Optyse检眼镜时的视网膜视野通常在可接受的临床范围内，这表明当成本不允许使用任何其他类型的检眼镜时，这种相对便宜的检眼镜可能有一席之地。
