Interpupillary distance in a normal black population

Area of Science:

• Ophthalmology
• Anthropometry
• Pediatrics

Background:

• Previous research established normal interpupillary distance (IPD), inner canthal distance (ICD), and outer canthal distance (OCD) for White, Asian, and Mexican American populations.
• Normative data for these facial measurements in Black individuals were lacking.

Purpose of the Study:

• To establish normative values for outer canthal distance (OCD), inner canthal distance (ICD), and interpupillary distance (IPD) in a Black population.
• To compare these measurements with existing data for other racial groups.

Main Methods:

• Measurements of OCD, ICD, and head circumference (HC) were taken from 931 Black individuals (485 males, 446 females) aged birth to 24 years.
• Mean IPD was calculated using Pryor's formulation.
• Statistical analysis was performed to compare measurements between sexes and age groups, and against existing data for White individuals.

Main Results:

• Mean OCD and ICD in the Black sample were significantly higher than those reported for White individuals across all age levels (p < 0.001).
• ICD was significantly lower at birth but showed a more rapid increase in the first 3 months, reaching and maintaining higher values thereafter.
• Mean IPD values were significantly higher in both Black and White individuals compared to previous reports at each age level (p < 0.001).

Conclusions:

• The study provides crucial normative data for OCD, ICD, and IPD specific to the Black population.
• Findings suggest that race-specific reference values should be used for assessing these facial measurements in Black children and adults.
• These race-specific norms are essential for accurate clinical assessments and research involving Black individuals.