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The influence of head tilt on fovea-disc angle |
Lu Wuyi,Feng Huazhang,Peng Jie,Kang Xiaoli |
Department of Ophthalmology, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China |
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Abstract Objective To explore the influence of head tilt on fovea-disc angle (FDA). Methods This was a self-controlled study. 3D OCT-1000 was used to take fundus photos for 26 non-strabismus subjects (52 eyes) at entopic position, head to the right at 30° and head to the left at 30° respectively. CorelDRAW X4 drawing software was used to measure the FDA values in these photos. The data were analyzed using t test, analysis of variance and linear regression. Results FDA values: the differences in right eye among head to the right (13.53°±3.36°), entopic position (6.56°±2.28°) and head to the left (-0.53°±3.88°) had statistical significance (F=115.866, P<0.05). The FDA value of head to the right was significantly higher than that of the entopic position (P<0.05), while the FDA value of the entopic position was significantly higher than head to the left (P<0.05). The differences in left eye between head to the right (1.08°±3.31°), entopic position (7.31°±2.80°) and head to the left (13.45°±3.44°) had statistical significance (F=98.437, P<0.05). The FDA value of head to the right was significantly lower than that of the entopic position (P<0.05), while the FDA value of the entopic position was significantly lower than head to the left (P<0.05). There were no significant differences between the FDA values of different genders (t=0.906, P>0.05). The FDA values were not correlated with age (r=0.001, P>0.05). Conclusion Head tilt has a significant influence on fovea-disc angle. In clinical practice, when fundus photography is used to evaluate the fundus rotation of patients, attention should be paid to the placement of head.
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Received: 26 January 2015
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Corresponding Authors:
Kang Xiaoli,Email:kxlljlj@163.com
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