Autofocals: Evaluating gaze-contingent eyeglasses for presbyopes

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optometry

Background:

• Age-related loss of the eye's ability to focus on near objects, known as presbyopia, affects a significant global population.
• The stiffening of the crystalline lens is the primary cause of presbyopia, impacting visual function.

Purpose of the Study:

• To design and evaluate a novel presbyopia correction system called autofocals.
• To externally mimic the natural eye accommodation response using technology.

Main Methods:

• Autofocals were developed by integrating eye-tracking and depth-sensing data to control focus-tunable lenses.
• Visual acuity, contrast sensitivity, and refocusing task performance were assessed in 19 users.
• User preference for ease of refocusing was evaluated in a separate study with 37 participants.

Main Results:

• Autofocals demonstrated enhanced visual acuity compared to monovision and progressive lenses.
• Contrast sensitivity was comparable between autofocals and conventional methods.
• Autofocals provided faster and significantly more accurate refocusing than progressive lenses.
• A majority of users preferred autofocals for their ease of refocusing.

Conclusions:

• Autofocals represent a superior technological solution for presbyopia correction.
• This innovation has the potential to significantly improve the quality of life for millions affected by age-related farsightedness.