What type of segment would a hyperopic presbyopia tolerate?
Answer: Round top or down curve
What type of segment would a hyperopic presbyopia tolerate?
Answer: Round top or down curve
Showing posts with label Presbyopia. Show all posts
Showing posts with label Presbyopia. Show all posts
Answer: Round top or down curve
What type of segment would a myopic presbyopia tolerate?
What type of segment would a myopic presbyopia tolerate?
Answer: Flat top
Which bifocal design results in NO prismatic jump?
Which bifocal design results in NO prismatic jump?
Answer: Executive design - monocentric bifocal.
How can prismatic jump be minimised?
How can prismatic jump be minimised?
Answer: By designing the lens so that the optical centre of the near portion lies near the junction of the two portions.
Why won't anisometropia tolerated bifocals well?
Why won't anisometropia tolerated bifocals well?
Answer: The prismatic effect on each eye will be different --> diplopia, uncomfortable binocular vision.
How can prismatic effect at the NVP be minimised?
How can prismatic effect at the NVP be minimised?
Answer: By designing the lens so that the opitcal centre of the near segment overlies the NVP of the main lens exactly so that the segment contribute no additional prism above that of the main lens.
What contributes to the prismatic effect (image displacement) at the NVP?
What contributes to the prismatic effect (image displacement) at the NVP?
Answer:
The prismatic effect due to the main lens
The prismatic effect due to the near segment at this point.
What happens if the optical centres of the distance and near portions of a bifocal lens coincide with the DVP and NVP?
What happens if the optical centres of the distance and near portions of a bifocal lens coincide with the DVP and NVP?
Answer: Prismatic jump
With sclera expansion inserts, ___ superficial incisions in the ____ of the sclera are made. Implants are placed ____ the sclera causing a slight ___ in the sclera. This reduces the ___ of the underlying ___ muscle that surrounds the lens.
With sclera expansion inserts, ___ superficial incisions in the ____ of the sclera are made. Implants are placed ____ the sclera causing a slight ___ in the sclera. This reduces the ___ of the underlying ___ muscle that surrounds the lens.
Answer:
- 4
- Quadrants
- Inside
- Lift
- Crowding
- Ciliary
These were developed according to Schachter's theory.
These were developed according to Schachter's theory.
Answer: Sclera expansion inserts
1 hour post op CK, a band of ___ forms between the spots, creating a _____ effect.
1 hour post op CK, a band of ___ forms between the spots, creating a _____ effect.
Answer:
Striae
"Purse string"
CK ____ form 1 hour post-op.
CK ____ form 1 hour post-op.
Answer: Spots
Once a pt. Has CK done, over time, do the eyes become more hyperopic or myopic?
Once a pt. Has CK done, over time, do the eyes become more hyperopic or myopic?
Answer: Hyperopic
Is CK permanent?
Is CK permanent?
Answer: No
During CK, ___ is created to induce ___ to ___ of MYOPIA in the non-dominant eye.
During CK, ___ is created to induce ___ to ___ of MYOPIA in the non-dominant eye.
Answer:
- Monovision
- -1.00 D
- -1.50 D
The wounds from CK shrink the stromal tissue, ___ the central cornea.
The wounds from CK shrink the stromal tissue, ___ the central cornea.
Answer: Steepening
During CK, a ___-thin probe delivers radiofrequency energy to the ____ of the peripheral cornea in a ____ pattern (8 to 32 spots) of ___ eye.
During CK, a ___-thin probe delivers radiofrequency energy to the ____ of the peripheral cornea in a ____ pattern (8 to 32 spots) of ___ eye.
Answer:
- Hair
- Stroma
- Ring
- One
Another term for conductive keratoplasty (CK)
Another term for conductive keratoplasty (CK)
Answer: Corneal remodeling
During this procedure, a hair-thin probe delivers radio frequency energy to the stroma of the peripheral cornea in a ring pattern (8 or 32 spots) of one eye.
During this procedure, a hair-thin probe delivers radio frequency energy to the stroma of the peripheral cornea in a ring pattern (8 or 32 spots) of one eye.
Answer: CK
Two types of surgical treatments to "correct" presbyopia
Two types of surgical treatments to "correct" presbyopia
Answer:
- LASIK monovision
- Corneal remodeling or conductive keratoplasty (CK)
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