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Normal Exophthalmometry Values in Iranian Population: A Meta-analysis.

Abbas Bagheri^1,2, Kourosh Shahraki¹, Amir Arabi¹

¹Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Journal of Ophthalmic & Vision Research

|August 16, 2021

Summary

Normal eye protrusion in Iranians averages 16.3 mm, with the highest normal value at 20.1 mm. These exophthalmometry values are higher than Asians but lower than Caucasians.

Keywords:

Hertel Iran Meta-analysis Exophthalmometry

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Area of Science:

Ophthalmology
Population Health

Background:

Limited data exists on normal eye protrusion values for the Iranian population.
Establishing reference exophthalmometry values is crucial for diagnosing orbital diseases.

Purpose of the Study:

To determine the normal range of eye protrusion (exophthalmometry) in the Iranian population.
To provide a basis for the assessment of orbital diseases in Iran.

Main Methods:

A meta-analysis was conducted on four studies published between 1995 and 2010.
Searched English and Farsi literature in PubMed, ISI Web of Knowledge, SID, and Iran Medex using keywords related to proptosis and exophthalmometry.
Statistical analysis performed using Stata 15.0 software on data from 3,696 subjects.

Main Results:

The average eye protrusion in the Iranian population was 16.3 mm (men: 16.5 mm, women: 16.2 mm).
No significant difference was found between left (16.3 mm) and right (16.4 mm) eye protrusion.
Teenagers (13-19 years) had a mean protrusion of 17.1 mm, while those 20 years and older had 16.3 mm.
The highest normal value, considering two standard deviations, was determined to be 20.1 mm.

Conclusions:

Normal eye protrusion values in Iranians are higher than those reported for Asian populations.
Normal eye protrusion values in Iranians are lower than those reported for Caucasian populations.
These findings establish essential reference values for exophthalmometry in Iran, aiding in clinical practice.