+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Variations of central corneal curvature during the first year of contact lens wear



Variations of central corneal curvature during the first year of contact lens wear



Acta Ophthalmologica 61(1): 117-128



During hard, hydrophilic and silicone lens wear the variations of central corneal curvature in the 2 eyes of each individual were significantly correlated. Mean changes of principal radii of curvature were small in each lens group (-0.075-+0.068 mm). Hydrophilic lens wearers showed an initial mean flattening of corneal curvature, followed by a significant steepening. Hard lens wearers apparently showed the opposite sequence of mean changes. Silicone lens wearers showed a significant mean corneal flattening. Central corneal asphericity was reduced during hard lens wear. Considerable individual curvature changes occurred (-0.35-+0.30 mm), but none of these necessitated lens refitting. Changes of the central corneal thickness and curvature during hard lens wear were apparently inversely correlated, the ratio between the changes being about -0.08:1. Hard and silicone lenses probably exerted a mechanical moulding effect. The exact aetiology of curvature changes in hydrophilic lens wearers remains obscure. Corneal curvature changes appear less reliable than corneal oedema in the detection of lens-induced impairment.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 044944759

Download citation: RISBibTeXText

PMID: 6858637

DOI: 10.1111/j.1755-3768.1983.tb01402.x


Related references

Variations in central corneal thickness during the first year of contact lens wear. Acta Ophthalmologica 60(1): 57-69, 1982

The influence of soft contact lens wear and two weeks cessation of lens wear on corneal curvature. Contact Lens and Anterior Eye 37(1): 31-37, 2014

Corneal curvature changes in soft and rigid gas permeable contact lens wearers after two years of lens wear. Clao Journal 22(3): 186-188, 1996

Changes in corneal curvature associated with contact lens wear. Journal of the American Optometric Association 50(3): 375-377, 1979

Corneal curvature and astigmatic changes subsequent to contact lens wear. Journal of the American Optometric Association 36(11): 996-1000, 1965

Observations on contact lens clinics. 4. Statistics on normal corneal radius curvature in Japanese male and female. Selection of contact lens B.C. in cases of large and small corneal radius curvature. Kaiin Dayori. Membership News . Nippon Kontakuto Renzu Gakkai 11(4): 57-60, 1969

Changes in corneal curvature with long-term PMMA contact lens wear. Clao Journal 9(2): 121-125, 1983

Central corneal thickness and corneal hysteresis during corneal swelling induced by contact lens wear with eye closure. American Journal of Ophthalmology 143(4): 616-622, 2007

The effects of long-term contact lens wear on corneal thickness, curvature, and surface regularity. Ophthalmology 107(1): 105-111, 2000

Variations in the corneal surface temperature with contact lens wear. Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine 221(4): 337-349, 2007

Variations in corneal curvature and refractive error in CAB gas-permeable contact lens wearers. Journal of the American Optometric Association 55(3): 217-219, 1984

Measurement of corneal swelling variations without removal of the contact lens during extended wear. Investigative Ophthalmology & Visual Science 48(7): 3043-3050, 2007

The effects of wearing the Boston II gas-permeable contact lens on central corneal curvature. American Journal of Optometry and Physiological Optics 62(8): 497-500, 1985

Effect of contact lens wear on central corneal thickness measurements. Journal of Cataract and Refractive Surgery 29(7): 1319-1322, 2003

The effect of contact lens wear on the central and peripheral corneal endothelium. Cornea 19(1): 47-51, 2000