Ntim-Amponsah C T
University of Ghana Medical School, Accra, Ghana.
West Afr J Med. 1997 Jul-Sep;16(3):191-4.
The Topcon Computerised Tonometer CT-20, a non-contact tonometer (NCT), was used to measure intraocular pressure (IOP) in mmHg in 1,226 subjects above the age of 30 years with no ocular pathology. The mean IOP was 14.41 mmHg and the standard deviation 3.43. The mean IOP far was higher in female (14.60) than male (14.22). This gender difference in the mean IOP was significant; t stat = 2.69, P < 0.5. Right IOP exceeded left IOP and this was highly significant in both male (t stat 4.03) and female (t stat 5.64) p < 0.01. This IOP asymmetry approximates a normal distribution. The mean of the differences (right-left IOP) and standard deviation for all subjects were 0.57 and 2.26 respectively. The range for the differences was- 10 to 10 mmHg. Asymmetry was greater in females than males (t stat = 2.05, p < 0.05). Knowledge of these statistics will help in decisions concerning glaucoma screening with NCT.
拓普康电脑眼压计CT - 20，一种非接触眼压计（NCT），用于测量1226名30岁以上无眼部病变受试者的眼压（IOP），单位为毫米汞柱。平均眼压为14.41毫米汞柱，标准差为3.43。女性的平均眼压（14.60）远高于男性（14.22）。平均眼压的这种性别差异具有显著性；t统计量= 2.69，P < 0.5。右眼眼压超过左眼眼压，这在男性（t统计量4.03）和女性（t统计量5.64）中均具有高度显著性，P < 0.01。这种眼压不对称近似正态分布。所有受试者的差异均值（右眼眼压 - 左眼眼压）和标准差分别为0.57和2.26。差异范围为 - 10至10毫米汞柱。女性的不对称性大于男性（t统计量= 2.05，P < 0.05）。了解这些统计数据将有助于在使用NCT进行青光眼筛查时做出决策。
