Beyond traditional subjective refraction.

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Subjective refraction is the cornerstone of refractive error evaluation in eye care.
• The traditional manual method for subjective refraction has remained largely unchanged for two centuries.
• There is a need for more efficient and accurate methods for refractive error assessment.

Purpose of the Study:

• To review emerging technologies and novel approaches aimed at enhancing the traditional subjective refraction procedure.
• To explore innovations that could potentially replace or augment current methods for determining refractive error.
• To assess the advancements in subjective refraction technologies for improved eye care.

Main Methods:

• Review of recent technological advancements and novel approaches in subjective refraction.
• Analysis of instruments utilizing motorized phoropters with automatic algorithms or self-refraction capabilities.
• Examination of hybrid systems integrating objective and subjective measurements.
• Investigation of new visual tasks for subjective refractive error determination beyond traditional blur estimation.

Main Results:

• Various new technologies, from prototypes to commercial instruments, aim for reliable and rapid subjective refractions.
• Approaches include automated algorithms, self-refraction, integrated objective/subjective measurements, and novel visual tasks.
• These methods offer alternatives to manual blur reduction for subjective refractive error assessment.

Conclusions:

• The trend in subjective refraction is shifting towards automated and self-refraction instruments.
• These newer technologies promise faster measurements and reduced variability compared to traditional methods.
• Several innovations are commercially available and show potential to become the new standard in subjective refraction.