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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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Change in keratometry readings between morning and afternoon after different durations of lens wear.
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Figure 5: Change in keratometry readings between morning and afternoon after different durations of lens wear.

Mentions: Apical corneal powers were obtained from the central 3.0 mm of optic zone cornea. Mean K value was calculated by averaging vertical and horizontal K values. Fluctuations during the day continuously changed up to week 12, although amplitude of change decreased to a statistically significant level after 4 weeks (p<0.05). Fig. 3 shows the change in best measured sphere for both morning and afternoon after different durations of OK lens wear. These results and the outcome of statistical analyses performed on these data are summarized in Table 2. Figs. 4 and 5 each demonstrate change in apical corneal power and K readings for both morning and afternoon after different durations of lens wear.


Sustainability of orthokeratology as demonstrated by corneal topography.

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

Change in keratometry readings between morning and afternoon after different durations of lens wear.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Change in keratometry readings between morning and afternoon after different durations of lens wear.
Mentions: Apical corneal powers were obtained from the central 3.0 mm of optic zone cornea. Mean K value was calculated by averaging vertical and horizontal K values. Fluctuations during the day continuously changed up to week 12, although amplitude of change decreased to a statistically significant level after 4 weeks (p<0.05). Fig. 3 shows the change in best measured sphere for both morning and afternoon after different durations of OK lens wear. These results and the outcome of statistical analyses performed on these data are summarized in Table 2. Figs. 4 and 5 each demonstrate change in apical corneal power and K readings for both morning and afternoon after different durations of lens wear.

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