Myopia Control and Contact Lenses Flashcards
When axial length reaches 26 mm, the odds of visual impairment by age 60 are __x
2
Every mm of axial length changes equals how many diopters of refractive error change?
~3D
What is the rate of axial length growth in emmotropic eyes?
0.1-0.2 mm per year before age 10
myopic eyes grow more than 0.3 mm per year
What causes the axial lengthening that occurs in myopia?
scleral remodeling
progressive myopia: existing collagen is degraded
Fill in the factors for high risk of myopia by 8th grade
A. <+0.75 D
B. </= +0.50 D
C. </= +0.25 D
D. </= +0.00 D
A. age 6; B. ages 7-8; C. ages 9-10; D. age 11
What are the treatment options for myopia control?
multifocal glasses; multifocal contact lenses; OrthoK; atropine drops
How does OrthoK work for myopia control?
generates myopic defocus by flattening the central cornea and steepening the paracentral cornea
How do multifocal contacts work for myopia control
Reduce hyperopic defocus in the periphery of the retina
ALWAYS use Center D
check acuities monocularly
What are the soft multifocal options for myopia control?
Proclear, Biofinity, NaturalVue, MiSight
Proclear and Biofinity are available in toric
MiSight: only FDA approved for myopia control
What OrthoK lens is FDA approved for myopia management?
Acuvue Abiliti
available for astigmatism
What add do you use when using multifocal SCL for myopia control?
+2.50
unless induces high XP
</=+1.50 ineffective
How do you fit MiSight lenses?
like a single vision distance sphere lens
SE for astigmatism
FDA: -0.75–4.00 w/ </= 0.75 DC
How long should MiSight be worn every day?
at least 10 hours per day
and 6 days per week
What two myopia control lenses do not specify an add?
MiSight and NaturalVue
NaturalVue effective add up to +3.00
