ULTRASONOGRAPHIC MEASUREMENTS OF OCULAR VOLUME IN NIGERIAN ADULTS IN OSOGBO, NIGERIA
Introduction: Ocular volume measurement is essential for prompt diagnosis and management of eye diseases such as microphthalmos, buphthalmos, macrophthalmos, orbital tumours and refractive errors such as myopia and hypermetropia.
Aims and Objective: To measure ocular volume in a population of Nigerian adults with B-mode ultrasonography and establish the range of normal ocular volumes in the population studied.
Materials and Method: Four hundred subjects were scanned in this study using Sonoace X8 Ultrasound Machine (Medison, South Korea). Each subject eyeball volume was measured by B-mode ultrasonography. The ocular volumes were correlated with sex, age, height, and weight and body mass index. The data from the study was analyzed using statistical package for social science software version 17 (SPSS Inc, Chicago).
Result: Of the 400 subjects evaluated, 56.3% were female. The mean age of the subjects was 36.67years ± 10.84, while that of the male and female subjects were 36.46years ± 11.32 and 36.93years ± 10.46 respectively. The right ocular volume (ROV) was slightly larger than the left ocular volume (LOV) in both sexes [male: ROV=8.38cm3 ± 0.57, LOV=8.31cm3 ± 0.48; female: ROV=8.31cm3 ± 0.58, LOV=8.21cm3 ± 0.56], although the differences between the ocular volumes were not statistically significant in both genders [p>0.005]. Both eyeball increased in volume till fourth decade of life; right ocular volume increased till thirty-two years of age while left ocular volumes increased till forty-two years of age. Both ocular Volumes thereafter decreased gradually as age increased. The ocular volume correlated positively with the age and height, but negatively with the weight and body mass index in both genders.
Conclusion: The ocular volume correlated positively with the age and height; and negatively with the weight and body mass index of the subjects. It was observed that males had slightly
larger eyeballs in comparison to females, and that right eyeball volume was larger than the left eyeball volume. The differences were not statistically significant.