6 PRIMER (MEASUREMENTS) Flashcards
GULLSTRAND'S SCHEMATIC EYE INDEX OF REFRACTION: * CORNEA * AQEOUS HUMOR * CRYSTALLINE LENS (cortex) (nucleus) * VITREOUS HUMOR
- CORNEA 1.376
- AQEOUS HUMOR 1.336
- CRYSTALLINE LENS
1. 386 (cortex)
1. 406 (nucleus) - VITREOUS HUMOR 1.336
Higher index of refraction
- slower speed of light
- faster speed of light
slower speed of light
Higher index of refraction
- lesser bending
- greater bending
greater bending
Lower index of refraction
- slower speed of light
- faster speed of light
faster speed of light
Lower index of refraction
- lesser bending
- greater bending
lesser bending
RADIUS OF CURVATURE
CORNEA front surface: \_\_\_\_\_mm back surface: \_\_\_\_\_mm LENS front surface: \_\_\_\_\_mm back surface: \_\_\_\_\_mm
RADIUS OF CURVATURE
CORNEA front surface: 7.7mm back surface: 6.8mm LENS front surface: 10.0mm back surface: 6.0mm
Shorter radius of curvature:
- flatter
- steeper
steeper
Shorter radius of curvature:
- lesser power
- greater power
greater power
Shorter radius of curvature:
- lesser bending
- greater bending
greater bending
Longer radius of curvature:
- flatter
- steeper
flatter
Shorter radius of curvature:
- lesser power
- greater power
lesser power
Shorter radius of curvature:
- lesser bending
- greater bending
lesser bending
REFRACTIVE POWER
CORNEA: ____ D
LENS (UNACCOMMODATED): ____ D
COMPLETE EYE (UNACCOMMODATED: ____ D
REFRACTIVE POWER
CORNEA: 43.05 D
LENS (UNACCOMMODATED): 19.11 D
COMPLETE EYE (UNACCOMMODATED: 58.64 D
Higher refractive power
- lesser bending
- greater bending
greater bending
Lesser refractive power
- lesser bending
- greater bending
lesser bending
2/3 of refraction of the eye
- Cornea
- Tear film
- Crystalline Lens
Cornea
Power ranges from 36.00-50.00 D (average: 43.00 D)
- Cornea
- Tear film
- Crystalline Lens
Cornea
index: 1.376
- Cornea
- Tear film
- Crystalline Lens
Cornea
Where cornea owes its clear optical
- Cornea
- Tear film
- Crystalline Lens
Tear film
First surface where light is refracted followed by the cornea
- Cornea
- Tear film
- Crystalline Lens
Tear film
Steeper curvature will result to:
- lower surface power
- higher surface power
higher surface power
CL w/ shorter RC
- flatter tear layer radius
- steep tear layer radius
increase corneal power posterior
steep tear layer radius
CL w/ shorter RC
- decrease corneal power posterior
- increase corneal power posterior
increase corneal power posterior
Flatter curvature will result to
- lower surface power
- higher surface power
lower surface power