The Ortho-K lens for spherical applications up to -4.50
The Ortho-K contact lenses are worn during overnight in order to reduce the present ametropia. Ortho-K is an optically technical applications of RGP contact lenses with the aim of slowing progression and temporarily reducing myopia and astigmatism.
corneal astigmatism according to the rule up to cylinder -1.50
cornea astigmatism against the rule until cylinder -0.75
Professional groups such as pilots, policemen and firefighters (some review bodies exclude persons who have undergone refractive surgery or Ortho-K).
Depending on the ametropia to be corrected, the customer generally needs 10 to 14 days to achieve an uncorrected good vision throughout the day. To achieve this, the contact lenses will need to be worn at night for 6-8 hours.
B.C.R. 7.00 – 9.50 per 0.05 ascending
Power +0.75 (standard)
Lens diameter 10.00 – 11.20 per 0.20 ascending
First determine the ametropia and assess the anterior eye segment with the slit lamp and a cornea topograph.
A cornea topographer is required to successfully adjust this contact lens.
The use of a cornea topographer is necessary to:
To identify Ppthological abnormalities such as keratoconus and corneal degeneration
Follow and digitally record changes in the shape of the cornea that take place
To determine the location and size of the zone to be corrected.
Vertical corneal diameter
The required reversed curve is calculated by the laboratory.
The Ortho-K contact lenses are supplied in Boston XO2 material and in two colours; right in the colour violet, left in the colour blue.
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