Mean cycloplegic refractive error in emmetropic adults - The Tehran Eye Study

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Refractive error development follows distinct patterns in children and older adults.
• A potential period of myopic refractive error between these age groups is debated.
• Understanding adult refractive error is key to comprehensive vision care.

Purpose of the Study:

• To investigate the mean cycloplegic refractive error in adults aged 20-40 years.
• To determine if a myopic refractive error period exists between childhood and presbyopia.
• To clarify refractive error trends in the adult population.

Main Methods:

• A cross-sectional study of 3,576 participants in Tehran.
• Cycloplegic and non-cycloplegic refractive errors were measured.
• Data were analyzed using Bigaussian function fitting for age-stratified groups.

Main Results:

• Mean cycloplegic refractive error was stable at +0.50D from before age 20 to 50 years.
• Non-cycloplegic refractive error showed a stable phase between 15-45 years.
• Refractive error became more hypermetropic after age 45-50.

Conclusions:

• The study disproves a distinct myopic refractive error period in adults aged 20-50 years.
• Adult cycloplegic refractive error averages approximately +0.50D during this period.
• Refractive error trends suggest a shift towards hypermetropia in later adulthood.