Negative-lens field expander for patients with concentric field constriction

Area of Science:

• Ophthalmology
• Vision Science
• Rehabilitation Engineering

Background:

• Peripheral field loss significantly impairs mobility and orientation.
• Patients with intact central vision but peripheral loss often struggle with navigation.
• Existing assistive devices may be complex or costly.

Purpose of the Study:

• To evaluate an oversized, negative-power spectacle lens as a visual field expander.
• To assess the device's efficacy in improving mobility and orientation.
• To determine the practicality of this low-cost assistive technology.

Main Methods:

• Utilized an oversized, negative-power spectacle lens as a field expanding device.
• Assessed patient mobility and general orientation ability.
• Focused on individuals with peripheral field loss and preserved central vision.

Main Results:

• The spectacle lens effectively acted as a field expander.
• Observed improvements in patient mobility and orientation.
• The device demonstrated ease of use for spotting tasks.

Conclusions:

• Oversized, negative-power spectacle lenses offer a viable solution for visual field expansion.
• This approach provides an inexpensive and simple method to aid patients with peripheral vision loss.
• The device shows potential for enhancing independence and quality of life.