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Factors Affecting Contrast Sensitivity in Healthy Individuals: A Pilot Study

View Article: PubMed Central - PubMed

ABSTRACT

Objectives:: To determine the demographic and ocular features affecting contrast sensitivity levels in healthy individuals.

Materials and methods:: Seventy-four eyes of 37 subjects (7-65 years old) with refractive errors less than 1.0 diopter, no history of ocular surgery, and 20/20 visual acuity were included in the study. The participants were divided by age into three groups: group 1, 7-19 years, n=11; group 2, 20-49 years, n=15; and group 3, 50-65 years, n=11. All subjects underwent anterior and posterior segment evaluation, intraocular pressure measurements, refraction measurements, and clinical evaluation for strabismus. Contrast static test was performed using Metrovision MonPack 3 vision monitor system after measuring pupil diameter. Photopic and mesopic measurements were taken sequentially from right eyes, left eyes, and both eyes together.

Results:: Contrast sensitivity at intermediate and high spatial frequencies was lower with increasing age. Binocular measurements were better than monocular, and mesopic measurements were better than photopic measurements at all spatial frequencies. Contrast sensitivity at higher spatial frequency was lower with hyperopic refraction values.

Conclusion:: Increasing age, small pupil diameter, hyperopia, and photopic conditions were associated with lower contrast sensitivity in healthy individuals. Binocular contrast sensitivity measurements were better than monocular contrast sensitivity measurements in all conditions and spatial frequencies.

No MeSH data available.


Effect of pupil diameter on scotopic contrast sensitivity values
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f4: Effect of pupil diameter on scotopic contrast sensitivity values

Mentions: In photopic conditions, pupil diameter had no effect on contrast sensitivity values. In mesopic conditions, contrast sensitivity values at high spatial frequencies increased in association with larger pupil diameter (Table 2, Figure 4). Evaluation of the association between contrast sensitivity and spherical equivalent at low refractive errors revealed that contrast sensitivity was decreased at intermediate and especially at high spatial frequencies as refraction became hypermetropic (p<0.01). In mesopic conditions, pupil diameter was smaller in hypermetropes (p<0.05).


Factors Affecting Contrast Sensitivity in Healthy Individuals: A Pilot Study
Effect of pupil diameter on scotopic contrast sensitivity values
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384124&req=5

f4: Effect of pupil diameter on scotopic contrast sensitivity values
Mentions: In photopic conditions, pupil diameter had no effect on contrast sensitivity values. In mesopic conditions, contrast sensitivity values at high spatial frequencies increased in association with larger pupil diameter (Table 2, Figure 4). Evaluation of the association between contrast sensitivity and spherical equivalent at low refractive errors revealed that contrast sensitivity was decreased at intermediate and especially at high spatial frequencies as refraction became hypermetropic (p<0.01). In mesopic conditions, pupil diameter was smaller in hypermetropes (p<0.05).

View Article: PubMed Central - PubMed

ABSTRACT

Objectives:: To determine the demographic and ocular features affecting contrast sensitivity levels in healthy individuals.

Materials and methods:: Seventy-four eyes of 37 subjects (7-65 years old) with refractive errors less than 1.0 diopter, no history of ocular surgery, and 20/20 visual acuity were included in the study. The participants were divided by age into three groups: group 1, 7-19 years, n=11; group 2, 20-49 years, n=15; and group 3, 50-65 years, n=11. All subjects underwent anterior and posterior segment evaluation, intraocular pressure measurements, refraction measurements, and clinical evaluation for strabismus. Contrast static test was performed using Metrovision MonPack 3 vision monitor system after measuring pupil diameter. Photopic and mesopic measurements were taken sequentially from right eyes, left eyes, and both eyes together.

Results:: Contrast sensitivity at intermediate and high spatial frequencies was lower with increasing age. Binocular measurements were better than monocular, and mesopic measurements were better than photopic measurements at all spatial frequencies. Contrast sensitivity at higher spatial frequency was lower with hyperopic refraction values.

Conclusion:: Increasing age, small pupil diameter, hyperopia, and photopic conditions were associated with lower contrast sensitivity in healthy individuals. Binocular contrast sensitivity measurements were better than monocular contrast sensitivity measurements in all conditions and spatial frequencies.

No MeSH data available.