A comparison of the contrast sensitivity function between age-matched phakic emmetropes and pseudophakic individuals
Undrakonda Vivekanand1, Yogish Subraya Kamath2
1Department of Ophthalmology, Alluri Sitaramaraju Academy of Medical Sciences, Eluru, Andhra Pradesh, India.
Purpose:
The purpose of this study is to compare the contrast sensitivity function (CSF) between eyes of age-matched individuals with aspheric intraocular lens (IOL) and emmetropia.
Methods:
A prospective hospital-based case-control study in South India was conducted to study the CSF in the eyes of patients between the ages of 50-60 years. The CSF was compared between those with emmetropia and those implanted with an indigenous aspheric IOL. Twenty-five consecutive patients were recruited in both groups. The independent sample t-test was used for analysis.
Results:
The mean age was 53.08 ± 1.96 years and 57.68 ± 2.85 years in normal emmetropes and emmetropic pseudophakic with aspheric IOL, respectively. The mean CSF showed a statistically significant difference (P < 0.000) between the normal emmetropic eyes and pseudophakic eyes with the values being 1.91 and 1.572, respectively.
Conclusion:
The CSF was significantly better in the eyes of age-matched normal emmetropes when compared to those with an aspheric IOL implanted.
Related Concept Videos
Sign Test for Matched Pairs
To conduct the sign test, we first calculate the differences in...
The Sense of Self: Reflected Self-Appraisal and Social Comparison
Impact of Individuals on Individuals
Phase Contrast and Differential Interference Contrast Microscopy
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Aging
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Wilcoxon Signed-Ranks Test for Matched Pairs


