Refraction, axial length and age-related maculopathy

Area of Science:

• Ophthalmology
• Gerontology
• Vision Science

Background:

• Age-related maculopathy (ARM) and age-related macular degeneration (AMD) are leading causes of vision impairment in older adults.
• Understanding risk factors, including ocular biometry and refractive error, is crucial for AMD/ARM research.
• Previous studies have yielded mixed results regarding the association between AMD/ARM and axial length or refraction.

Purpose of the Study:

• To investigate the relationship between age-related maculopathy (ARM)/age-related macular degeneration (AMD) and phakic refraction.
• To examine the association between ARM/AMD and axial length.
• To identify potential demographic influences on these relationships.

Main Methods:

• A point prevalence study involving 663 randomly selected individuals over 65 years old.
• Measurement of axial length and refraction in participants' eyes.
• Grading of fundus images for ARM using a modified Wisconsin standard, with analysis of individual eyes and pairs.

Main Results:

• No statistically significant differences in refraction or axial length were observed across different stages of ARM.
• A statistically significant sex difference was noted: women exhibited shorter mean axial lengths (0.57 mm less than men) and were more hypermetropic (+0.66 D at age 70) than men.
• Mean axial length was approximately 23.2 mm, and mean refraction was around +1.0 D.

Conclusions:

• The study found no statistically significant association between axial length/refraction and the presence or stage of AMD/ARM.
• Significant sex-based differences in axial length and refractive error were confirmed in the studied population.
• Further research may be needed to explore other potential risk factors for AMD/ARM.