A normal adult human eye measures approximately 24.2 mm (transverse) × 23.7 mm (sagittal) × 22.0–24.8 mm (axial). There's no significant difference in size between sexes or age groups. However, some variation is normal, with the transverse diameter potentially ranging from 21 mm to 27 mm.
Understanding Eye Measurements
- Transverse diameter: The width of the eye from side to side.
- Sagittal diameter: The width of the eye from front to back (vertical dimension).
- Axial length: The length of the eye from front to back (horizontal dimension, along the visual axis). This is often the measurement focused on when discussing eye size in relation to conditions like myopia (nearsightedness).
This information is consistent across multiple reputable sources, including research articles like "Variations in Eyeball Diameters of the Healthy Adults" https://pubmed.ncbi.nlm.nih.gov/25431659/ and information found within the EyeWiki. It's important to note that pupil size, the black circle in the center of the eye, is separate and variable depending on light conditions and other factors. Pupil size is not a direct indicator of overall eye size.
It's crucial to remember that these are average measurements. Individual variations within this range are considered perfectly normal. Significant deviations from these measurements could indicate an underlying condition, requiring professional evaluation by an ophthalmologist or optometrist.
