Quiz For Orthokeratology

Orthokeratology:

Orthokeratology:

Orthokeratology is also known as:

1. precision corneal molding
2. controlled keratore formation
3. corneal refractive therapy
4. vision shaping treatment

_____________________ utilized a standard PMMA lens that was flatter than the cornea by the amount of the correction.

In order to allow more oxygen to reach the cornea, early technicians often fit the lenses __________________.

Flattening the cornea would often result in_________________.

In the early years of ortho-k the techniques of _______________ were most utilized by technicians.

A major advance in lens design, which caused a resurgence in the interest of ortho-k lenses was known as RG. RG stands for ________________.

RG lenses are designated so that the peripheral curve is:

The use of computer-driven lathes in the early 1990’s led to:

_______________ enables ortho-K lenses to be worn during sleep.

Overnight wear of any contact lens

On average, the patient can expect about a ________ reduction in myopia in about a ____________ period.

The FDA has approved the lenses for up to ______________–myopia and______________ of astigmatism.

Most ortho-k practices utilize _______________ lens design almost exclusively.

To flatten the central cornea and reduce myopia the base curve of an RG lens is made ___________________ cornea.

The base curve is usually made flatter by the amount of ______________.

The RG reverse geometry design

The Jesson method chooses standard lens known as:

To prevent lenses from decentering with a flat curve, the reverse curve _____________________________.

_____________________ has written perhaps the most comprehensive mechanical description on how RG lenses work.

_______________ that is formed under the reverse curve results in a dramatic difference in tear lens thickness between the center of the cornea and the back of the lens:

In order for ortho-K to work there must be:

The corneal refractive therapy system CRT:

Using the CRT system:

The BE System is:

The BE software calculates:

1. predicted lens value
2. lens parameters to provide an ideal tear film under the lens
3. pantoscopic tilt
4. the Jessen method of base curve calculation

The __________________________system is a reverse geometry lens design that utilizes corneal eccentricity as a key fitting factor.

The _______________________ is a reverse geometry design with four zones: A back optical zone, a steep reverse curve and one or more alignment curves for clearance and tear exchange.

_________________ is reverse geometry lens utilizing reverse geometry with four zones: the back optic zone, the reverse curve, the alignment curve and the peripheral curve. The parameters for the initial lens is determined by providing the patient refraction keratometry readings and Horizontal Visible Iris Diameter (HVID). The lab will utilize computer calculations to design the best fit

Follow up visits should not necessarily include _________________.

When there were complications caused by infection of microbes, they were most often caused by:

Complications can best be minimized through the use of:

1. proper cleaning techniques
2. patient education
3. appropriate lens maintenance
4. all in one solutions

Modern orthokeratology practices use ___________ lenses almost exclusively.

The basic techniques applicable to most RG lens designs,

The first follow-up visit should occur

In addition to the one day visit patients should be evaluated again at:

The basic testing procedures for follow up visits include but are not limited to the following except:

If minus power is detected in the over refraction:

A well fitting RG lens will display a _____________________.