Comparison of objective accommodation in phakic and pseudophakic eyes between age groups

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Objective accommodation is crucial for clear vision at varying distances.
• Age-related changes in the crystalline lens affect accommodative ability.
• Pseudophakic eyes with intraocular lenses (IOLs) may have altered accommodative function compared to phakic eyes.

Purpose of the Study:

• To compare objective accommodation in phakic and pseudophakic eyes across different age groups.
• To investigate the influence of age on the accommodative response in individuals with and without IOLs.

Main Methods:

• Eighty-three participants aged 40 years or older with good visual acuity and minimal refractive error were included.
• Participants were categorized into four groups: younger pseudophakic, older pseudophakic, younger phakic, and older phakic.
• Objective accommodation and pupil diameter were measured using a binocular open-field autorefractor with 2.0-D and 3.0-D stimuli.

Main Results:

• Younger pseudophakic patients (Group 1) demonstrated greater objective accommodation than older pseudophakic patients (Group 2) and older phakic patients (Group 4).
• Phakic patients (Group 3) exhibited significantly higher objective accommodation than both pseudophakic groups (1 and 2) and older phakic patients (Group 4).
• A significant correlation was observed between objective accommodation and changes in pupil size for both stimuli.

Conclusions:

• Age plays a role in objective accommodation, particularly in younger pseudophakic individuals.
• The findings suggest that pseudophakic eyes, even in younger patients, may not fully replicate the accommodative capacity of phakic eyes.
• Further research may explore IOL designs to improve accommodative function in pseudophakic patients.