The effect of refractive lenses on perceived direction

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Refractive lenses, including spectacles and contact lenses, are commonly used to correct myopia.
• The accuracy of directional localization can be influenced by the optical properties of corrective lenses, such as prismatic effects.
• Understanding how different lens types affect visual perception is crucial for optimizing vision correction.

Purpose of the Study:

• To compare the accuracy of directional localization between spectacles and contact lenses in myopic individuals.
• To investigate the influence of lighting conditions (dark vs. light) on directional judgments with different refractive lenses.
• To determine if spectacle wearers utilize eye position information for direction judgments in the light.

Main Methods:

• Open-loop pointing accuracy was assessed in four habitual myopic contact lens wearers.
• Directional localization was tested with a single light target in the dark and an array of lights in the light.
• Regression slopes of indicated versus actual target position were analyzed for both spectacles and contact lenses.

Main Results:

• In the dark, a significantly lower regression slope was observed for spectacles compared to contact lenses, aligning with predicted prismatic effects.
• In the light, no significant difference in regression slopes was found between spectacles and contact lenses.
• This indicates that the prismatic effect of spectacles impacts directional judgments in low-light conditions.

Conclusions:

• Spectacle wearers' directional localization accuracy is significantly affected by prismatic effects in the dark.
• The difference in accuracy between spectacles and contact lenses diminishes in the light.
• These findings suggest that spectacle wearers may not rely on eye position cues for directional judgments when visual context is present.