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.
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Presbyopia
- What type of segment would a hyperopic presbyopia tolerate?
- What type of segment would a myopic presbyopia tolerate?
- Which bifocal design results in NO prismatic jump?
- How can prismatic jump be minimised?
- Why won't anisometropia tolerated bifocals well?
- What contributes to the prismatic effect (image displacement) at the NVP?
- What happens if the optical centres of the distance and near portions of a bifocal lens coincide with the DVP and NVP?
- 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.
- These were developed according to Schachter's theory.
- 1 hour post op CK, a band of ___ forms between the spots, creating a _____ effect.
- CK ____ form 1 hour post-op.
- Once a pt. Has CK done, over time, do the eyes become more hyperopic or myopic?
- Is CK permanent?
- During CK, ___ is created to induce ___ to ___ of MYOPIA in the non-dominant eye.
- The wounds from CK shrink the stromal tissue, ___ the central cornea.
- During CK, a ___-thin probe delivers radiofrequency energy to the ____ of the peripheral cornea in a ____ pattern (8 to 32 spots) of ___ eye.
- Another term for conductive keratoplasty (CK)
- 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.
- Two types of surgical treatments to "correct" presbyopia
- T/F LASIK monovision can be used to "correct" presbyopia
- Type of intraocular lens in which contraction and relaxation of the ciliary muscle moves the IOL to restore accommodation
- Diffractive lenses (type of intraocular lens) has been shown to results in excellent ____ VA, with high rates of spectacle ____
- This type of lens has been shown to result in excellent uncorrected visual acuity
- Found in special diffractive lenses