21 STEPS Flashcards
An objective method of examining the interior of the eye
1: Opthalmoscopy
To measure the anterior radius of curvature of cornea
2: Ophthalmometry
To determine Base Curve for CLs Fitting (hard CLs)
2
Assess the quality of tears
2
To assess any ocular pathology e.g. keratoconus/KI plana
2
To measure the tonic innervation of the muscles at 20 ft.
3: Habitual Phoria test @ Far
#8: Induced Phoria test @ Far
To determine lateral muscular imbalance at far
3: Habitual Phoria test @ Far
To measure the tonic innervation of the muscles at 16 inches
13A: Habitual Phoria test @ near
To determine the relative horizontal position of the visual axes when fusion has been broken
13A: Habitual Phoria test @ near
To determine the refractive power of the eye objectively
4: Static Retinoscopy
If Against movement
Add minus lenses
If With movement
Add plus lenses
Illumination for static retinoscopy
Dim
To measure intensity & deterioration of visual pattern
5: Dynamic Retinoscopy @ 20”
Test target for dynamic retinoscopy
Head of reti or magnets
Measures of negative relative accommodation @ 40”
6: Dynamic Retinoscopy @ 40”
Control lens of dynamic reti @ 40”
Gross of #5
To check the equality of spherical amount
7: Subjective Refraction Test @ Far
Checking the equalization on both eyes
Equilibrium test
Represents the point when the px can no longer compensate for the prism induced retinal disparity
Blur point
Represents the reserve of the total convergence @ far with activation of accommodative convergence
Break point
The limit of fusion field in a distance of 20 ft.; indicates that the induced retinal disparity has been decreased
Recovery point
To measure the vertical displacement under dissociation & equal vertical duction in view of relatively large # of pxs
12B: Vertical Duction Test @ Far
Measures the integrity and deterioration of the visual pattern
14A: Unfused cross cylinder test @ near