Ultrasound Biomicroscopy Study of Anterior Segment Measurements in Normal Eyes in a Tertiary Care Rural Hospital of SPRR Nellore District
Journal Title: Journal of Medical Science And clinical Research - Year 2014, Vol 2, Issue 12
Abstract
Because many of the structures imaged by ultrasound biomicroscopy cannot be clearly observed by any other method, it is helpful to define a system of measurement to be used in future assessment of normal and abnormal patients. The normal eye has much variability in the position and configuration of internal structures. We attempted to define these measurement positions in a way that would allow reproducibility in the future. By this study we can in detail know the anatomy of various anterior segment structures like cornea, ciliary body and iris etc and can measure Corneal thickness, Iris thickness (Iris thickness on TCPD, 2mm away from root of iris, and maximum iris thickness at the pupillary margin), Anterior Chamber Depth, Angle and other parameters like Angle Opening Distance (AOD), Trabecular Ciliary Process Distance, Iris Ciliary Process Distance. By measuring all these 9 parameters in normal subjects, in 100 subjects, the normative data is derived for the Indian eyes in the age group of 18 to 28 years by the technique of Ultrasound Biomicroscopy for the temporal anterior segment. i.e. at 9° clock position for right eye and 3° clock position for the left eye (temporal meridian). The measurements are calculated by calipers, which is in built in the system software. Visual acuity, slit lamp examination and fundus examination with direct ophthalmoscope were done in all subjects. Ultrasound biomicroscopy examination was conducted for both eyes under topical anaesthesia. The average value of Angle Opening Distance for the Right eye is 368.64+/-32.824 microns and for the Left eye is 375.30+/- 28.672 microns. The average value of Trabecular Ciliary Process Distance for the Right eye is 1114.00+/-98.144 microns and for the Left eye is 1100.50+/-101.169 microns. The average value of Iris Thickness 1 (ID1) for the Right eye is 416.16+/-54.281 microns and for the Left eye is 408.02+/- 54.049 microns. The average value of Iris Ciliary Process Distance for the Right eye is 306.51+/- 58.409 microns and for the Left eye is 305.60+/- 51.115 microns. The average value of Trabecular Iris Angle for the Right eye is 38.02+/ - 3.20 and for the Left eye is 37.71+/- 4.00. The average value of Iris Thickness 2 (ID2) for the Right eye is 480.00+/-48.596 microns and for the Left eye is 478.80+/- 56.466 microns. The average value of Iris Thickness 3 (ID3) for the Right eye is 518.80+/-42.221 microns and for the Left eye is 578.70+/- 36.753 microns. The average value of Central Corneal Thickness for the Right eye is 529.80 +/- 25.819 microns and for the Left eye is 530.90 +/- 20.005 microns. The average value of AC Depth for the Right eye is 3031.60 +/- 280.806 microns and for the Left eye is 3036.40 +/-229.635 microns.
Authors and Affiliations
Dr. R. Sudha
Keywords
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