Comparison of Interpupillary distance in myopic and hyperopic individuals

Abstract

Interpupillary distance is a basic parameter of oculofacial symmetry. This difference between the centers of two pupil has to be considered a vital measurement for the proper adjustment of eyeglasses. Different types of refractive errors have different interpupillary measurements. This difference evaluation can help manufacturer in making of spectacles Objective: To find out the difference of interpupillary distance in myopes and hypermetropes Methods: Study included 151 individuals with myopic and hypermetropic refractive error between the age of 20 and 50 years. Interpupillary distance was measured by centimeter ruler for near and with Autoreractometer (Topcon) for distance. Visual acuity measured by Standard Snellen test type then refractive error corrections were given by subjective and objective methods. Repetition was done for each test type for the purpose of accuracy Results: There was significant difference between the mean (IPD) interpupillary distance of myopes (62.00 ± 3.6) and hypertmetropes (60.31 ± 3.12) by (P < 0.01).  Out of 151 patients 88(58.3%) were females and 63(41.3 %) were males. Mean values of (IPD) are higher in myopic individuals than that of hypermetropic. Results are highly significant (P< 0.01) and positive correlation between myopic refractive error and measurement of (IPD) interpupillary distance. Whereas negative correlation between the myopic and hypermetropic (IPD) interpupillary distance with (-0.322). Out of total subjects 55 (39.0%) were aged 20 to 30 years and 55(36.4) between 31 to 40 years old and remaining 37(24.5%) between 41 to 50 years. From total 30 (19.9%) people were having   myopic refractive error IPD (59-61mm), 50(33.1%) with IPD (62-64mm)   and   71(47.0%) interpupillary distance in the range of (65-68mm). Results also showed that out of 151 patients 52 (34.4%) people having  hyperopic refractive error IPD (59-61mm) and 68(45.0) have IPD     (62-64mm)   and  31(20.5)  have  interpupillary distance  in the range of (65-68mm). Paired samples shows significant correlation Conclusions: Study concluded that Measurement of (IPD) interpupillary distance increased in myopic refractive error as compared to hypermetropia. Study also revealed wide nasal bridge in myopes than hypermetropes.