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Influence of age on peripheral aberration
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV. (Vision Enabling Lab)ORCID-id: 0000-0002-3745-0035
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för datavetenskap, fysik och matematik, DFM.
Linnéuniversitetet, Fakultetsnämnden för naturvetenskap och teknik, Institutionen för naturvetenskap, NV.
2010 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The purpose of this study is to compare peripheral higher order aberrations in young

and old emmetropic eyes across the horizontal (±40°) and inferior (–20°) visual field.

Introduction

 

 

People with central visual field loss use eccentric fixation for various visual tasks.

Recently studies have shown that the correction of lower order aberrations (defocus &

astigmatism) can improve eccentric vision in subjects with central visual field loss

(CFL)[1]. The CFL subjects mostly correspond to older age groups who use eccentric

fixation angles up to 20°–30°. While there have been studies comparing the off-axis

lower order aberrations in normal young and old subjects[2], there is only one recent

study, which has compared off-axis higher order aberrations in normal young and old

emmetropic eyes up to 20° (horizontal and vertical) eccentricity[3]. In this study we

have measured off-axis aberrations in a group of 10 young (23 ± 3 years) and 10 old

(57 ± 4 years) emmetropes. The aberrations of the right eye were measured using

COAS-HD VR Hartmann-Shack aberrometer in steps 10° out to ± 40° horizontally and

–20° inferiorly in the visual field. Subjects rotated the eyes to view the fixation targets,

which were red light emitting diodes, placed at 3 meter from the eye. The aberrations

were quantified for a pupil area 5 mm in diameter.

Discussion

 

 

Mixed between-within subject’s analysis of variance of the horizontal coma C13

showed that there was a statistically significant difference between age groups

(p<0.05). The coma increased linearly in both groups from nasal to temporal visual

field. The rate of change was greater in the old (slope = –0.027 μm/deg) compared

to the young (slope = –0.012 μm/deg) emmetropes. In the inferior visual field,

vertical coma C-13 changed linearly in both groups with higher values in old (slope =

0.015 μm/deg) compared to young (slope = 0.006 μm/deg). The mean spherical

aberration was positive in older emmetropes (0.053 μm) compared to young

emmetropes (-0.030 μm). The HO RMS showed a quadratic increase in the

periphery for both age groups. The HO RMS was greater in older emmetropes but it

was not statistically significant (p>0.05) when compared to young emmetropes.

 

Conclusions

 

 

Our results show that there is an increase in coma, spherical aberration, and HO

RMS with age in the periphery.

sted, utgiver, år, opplag, sider
2010.
Emneord [en]
Peripheral aberrations, Age, COAS-HD VR
HSV kategori
Forskningsprogram
Naturvetenskap, Optometri
Identifikatorer
URN: urn:nbn:se:lnu:diva-8670OAI: oai:DiVA.org:lnu-8670DiVA, id: diva2:353508
Konferanse
5th EMVPO 2010, Stockholm, Sweden
Tilgjengelig fra: 2010-09-27 Laget: 2010-09-27 Sist oppdatert: 2016-04-27bibliografisk kontrollert

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