Habitual higher order aberrations affect Landolt but not Vernier acuity

Area of Science:

• Ophthalmology
• Vision Science
• Optometry

Background:

• Ocular optical imperfections, including higher-order aberrations, can influence visual performance.
• Understanding the relationship between optical quality and different types of visual acuity is crucial for diagnosing and treating vision disorders.

Purpose of the Study:

• To investigate the relevance of the eye's optical imperfections for hyperacute vision.
• To differentiate the impact of ocular aberrations on resolution acuity versus hyperacuity thresholds.

Main Methods:

• Measured ocular wave aberrations, visual hyperacuity, and acuity thresholds in 31 young adult eyes.
• Analyzed correlations between optical quality metrics (e.g., higher-order aberrations, Strehl ratio, axial length, retinal image quality) and acuity performance (Landolt and Vernier).

Main Results:

• Landolt acuity thresholds showed significant correlations with lower higher-order aberrations, higher Strehl ratios, and axial length.
• A retinal image quality metric correlated with Landolt acuity thresholds.
• No significant correlations were found between optical quality metrics and Vernier acuity performance.

Conclusions:

• Hyperacuity thresholds are not affected by higher-order aberrations of the eye.
• Resolution acuity (Landolt) is influenced by optical quality, while hyperacuity (Vernier) is not, indicating distinct underlying visual mechanisms.