Pupil size affects coma value in certain eyes

Article

When compared with eyes of normal axial length, high-myopic pseudophakic eyes with posterior staphyloma had significantly less internal coma and less coma variations during mydriasis, according to recently published research.

When compared with eyes of normal axial length, high-myopic pseudophakic eyes with posterior staphyloma had significantly less internal coma and less coma variations during mydriasis, according to research published in Eye.

The researchers studied 60 eyes: 40 in highly myopic cataract patients with posterior staphyloma and 20 in cataract patients with normal axial length.

They found that the high-myopic pseudophakic eyes with posterior staphyloma had significantly lower values of internal coma - both under 4 mm and 6 mm pupil sizes - at 1 month after phacoemulsification and IOL implantation compared to eyes with normal axial length.

The high-myopic pseudophakic eyes with posterior staphyloma also had significantly lower internal total higher-order aberrations and third-order aberrations at 6-mm pupil size.

In addition, the researchers found statistically significant differences between the two groups in the variation from 4- to 6-mm pupil sizes for:

  • internal coma
  • internal third-order aberrations

  • internal total higher-order aberrations
  • ocular coma aberrations.

Strehl ratio increased significantly in high-myopic eyes and decreased slightly in normal axial length eyes after mydriasis, and modular transfer functions were found to vary in a statistically significant manner between the two groups at frequencies of 15, 30, 45 and 60 cycles/degree.

To read an abstract of the study, click here.

Newsletter

Join ophthalmologists across Europe—sign up for exclusive updates and innovations in surgical techniques and clinical care.

Recent Videos
Christine Curcio, PhD, of the University of Alabama at Birmingham Heersink School of Medicine, shares histology update and revised nomenclature for OCT with Sheryl Stevenson of the Eye Care Network and Ophthalmology Times
SriniVas R. Sadda, MD, FARVO, shares key points from his retina presentation at the International SPECTRALIS Symposium
Robert Sergott, MD, describes fluorescence lifetime imaging ophthalmoscopy (FLIO) and the International SPECTRALIS Symposium – And Beyond (ISS) in Heidelberg, Germany.
Rayaz Malik, MBChB, PhD, a professor of medicine at Weill Cornell Medicine - Qatar, spoke with Ophthalmology Times Europe about his presentation. It's titled "An eye on neurodegenerative diseases: Challenging the dogma" at the International SPECTRALIS Sympsoium. In conversation with Hattie Hayes, Ophthalmology Times Europe
Anat Loewenstein, MD, describes her presentation on remote imaging for age-related macular degeneration and geographic atrophy at the International SPECTRALIS Symposium, in conversation with Hattie Hayes of Ophthalmology Times Europe
Tyson Brunstetter, OD, PhD, a US Navy Aerospace Optometrist at the NASA Johnson Space Center in Houston, Texas, shares key takeaways from his keynote at the International SPECTRALIS Symposium (ISS)
Rayaz Malik, MBChB, PhD, shares his presentation, titled An eye on neurodegenerative diseases: Challenging the dogma, at this year's International SPECTRALIS Symposium
At the Retina World Congress, Siegfried Priglinger, MD, speaks about ensuring the best outcomes for preschool-aged patients
At the 2025 ASCRS meeting, Robert Ang, MD said small aperture IOLs can benefit all patients, especially those with complex corneas or who have undergone previous corneal refractive surgery
Viha Vig, MBChB graduate student at the University of Auckland, New Zealand, discusses her poster presentation on the relationship between mitochondiral disease, Alzheimer disease, and other types of dementia.
© 2025 MJH Life Sciences

All rights reserved.