The effect of phenylephrine and cyclopentolate on objective wavefront measurements

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Accurate refractive error assessment is crucial for visual function.
• Wavefront aberrometry provides detailed information about optical aberrations.
• Understanding the impact of cycloplegic agents on wavefront measurements is essential.

Purpose of the Study:

• To evaluate the effects of phenylephrine and cyclopentolate on wavefront refraction.
• To analyze the influence of these agents on fourth-order spherical aberration (C12).
• To determine optimal conditions for wavefront measurement.

Main Methods:

• A cohort study of 151 eyes using wavefront aberrometry (ALLEGRO WAVE).
• Objective refraction measured after phenylephrine (accommodated) and cyclopentolate (non-accommodated).
• Wavefront aberrations analyzed using Zernike expansion; objective wavefront sphere calculated.

Main Results:

• Phenylephrine induced a significant myopic shift (-0.66 D) due to accommodation.
• Cyclopentolate resulted in refraction close to a model eye (-0.08 D difference).
• Fourth-order spherical aberration (C12) sign changed significantly between phenylephrine and cyclopentolate at 7.0 mm pupil size.

Conclusions:

• Accommodation target fogging is recommended for reliable wavefront measurements.
• Weaker cycloplegics like tropicamide may offer a balance between relaxation and natural aberration values.
• These findings aid in standardizing wavefront analysis for clinical applications.