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Sustainability of orthokeratology as demonstrated by corneal topography.

Kang SY, Kim BK, Byun YJ - Korean J Ophthalmol (2007)

Bottom Line: K values averaged a mean of 42.4 mm at baseline, and reduced to 40.9 mm by week 12.UCVA and spherical refractive error did not change to a significant degree after 4 weeks.Although statistically insignificant minute fluctuations during the day were observed up to week 12, these fluctuations decreased to a statistically significant level after week 4.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Bundang Jaesang General Hospital, Daejin Medical Center, Sungnam, Korea.

ABSTRACT

Purpose: To determine the sustaining effects of orthokeratology.

Methods: This study enrolled 58 eyes with moderate myopia. LK-DM lenses (Lucid Korea Dream Lens) were fitted daily for at least eight hours on an overnight regimen. The effects of orthokeratology and it's sustainability throughout the day were recorded twice; immediately after removal in the morning and eight hours later. Sustainability was measured by comparing the changes from morning to afternoon for best uncorrected visual acuity, apical corneal power, keratometric values, spherical equivalent and induced astigmatism.

Results: UCVA demonstrated improved values at all follow up periods. Fluctuations during the day stabilized after 4 weeks of lens wear. K values averaged a mean of 42.4 mm at baseline, and reduced to 40.9 mm by week 12. Unaided logMAR visual acuity changed from 0.94+/-0.14 at baseline to -0.11+/-0.17 by week 12. The sustainability of orthokeratology, defined as the difference between morning and afternoon values of unaided logMAR visual acuity, increased from -0.82 on day 1 to -0.11 on week 12.

Conclusions: UCVA and spherical refractive error did not change to a significant degree after 4 weeks. Although statistically insignificant minute fluctuations during the day were observed up to week 12, these fluctuations decreased to a statistically significant level after week 4.

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Related in: MedlinePlus

The difference between morning and afternoon unaided logMAR visual acuity (UCVA), demonstrating increasing sustainability of orthokeratologic effects with increasing periods of lens wear.
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Figure 2: The difference between morning and afternoon unaided logMAR visual acuity (UCVA), demonstrating increasing sustainability of orthokeratologic effects with increasing periods of lens wear.

Mentions: At the time of lens removal, statistically significant improvement in unaided visual acuity (p<0.001, ANOVA) relative to baseline was found for all periods of lens wear in all subjects. As expected, there was a greater improvement in visual acuity in the morning immediately after lens removal. Fig. 1 shows the change in unaided visual acuity for both morning and afternoon after different durations of OK lens wear. This difference between morning and afternoon was designated as the sustainability of orthokeratology, and is demonstrated in Fig. 2. Sustainability increased with increasing durations of lens wear, finally stabilizing after week 4 (p<0.05). These results and the outcome of statistical analyses are summarized in Table 2.


Sustainability of orthokeratology as demonstrated by corneal topography.

Kang SY, Kim BK, Byun YJ - Korean J Ophthalmol (2007)

The difference between morning and afternoon unaided logMAR visual acuity (UCVA), demonstrating increasing sustainability of orthokeratologic effects with increasing periods of lens wear.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2629700&req=5

Figure 2: The difference between morning and afternoon unaided logMAR visual acuity (UCVA), demonstrating increasing sustainability of orthokeratologic effects with increasing periods of lens wear.
Mentions: At the time of lens removal, statistically significant improvement in unaided visual acuity (p<0.001, ANOVA) relative to baseline was found for all periods of lens wear in all subjects. As expected, there was a greater improvement in visual acuity in the morning immediately after lens removal. Fig. 1 shows the change in unaided visual acuity for both morning and afternoon after different durations of OK lens wear. This difference between morning and afternoon was designated as the sustainability of orthokeratology, and is demonstrated in Fig. 2. Sustainability increased with increasing durations of lens wear, finally stabilizing after week 4 (p<0.05). These results and the outcome of statistical analyses are summarized in Table 2.

Bottom Line: K values averaged a mean of 42.4 mm at baseline, and reduced to 40.9 mm by week 12.UCVA and spherical refractive error did not change to a significant degree after 4 weeks.Although statistically insignificant minute fluctuations during the day were observed up to week 12, these fluctuations decreased to a statistically significant level after week 4.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Bundang Jaesang General Hospital, Daejin Medical Center, Sungnam, Korea.

ABSTRACT

Purpose: To determine the sustaining effects of orthokeratology.

Methods: This study enrolled 58 eyes with moderate myopia. LK-DM lenses (Lucid Korea Dream Lens) were fitted daily for at least eight hours on an overnight regimen. The effects of orthokeratology and it's sustainability throughout the day were recorded twice; immediately after removal in the morning and eight hours later. Sustainability was measured by comparing the changes from morning to afternoon for best uncorrected visual acuity, apical corneal power, keratometric values, spherical equivalent and induced astigmatism.

Results: UCVA demonstrated improved values at all follow up periods. Fluctuations during the day stabilized after 4 weeks of lens wear. K values averaged a mean of 42.4 mm at baseline, and reduced to 40.9 mm by week 12. Unaided logMAR visual acuity changed from 0.94+/-0.14 at baseline to -0.11+/-0.17 by week 12. The sustainability of orthokeratology, defined as the difference between morning and afternoon values of unaided logMAR visual acuity, increased from -0.82 on day 1 to -0.11 on week 12.

Conclusions: UCVA and spherical refractive error did not change to a significant degree after 4 weeks. Although statistically insignificant minute fluctuations during the day were observed up to week 12, these fluctuations decreased to a statistically significant level after week 4.

Show MeSH
Related in: MedlinePlus