- The aspheric lens design can do all of these EXCEPT: A) reduce peripheral aberrationB) reduce magnificationC) reduce FOVD) reduce lens weight/thicknessE) reduce ring scotomaF) improve appearance.
- The retinal image size for a corrected axial or refractive hyperope is _______ compared to their uncorrected state.
- True or False. A ring scotoma can be entirely eliminated if certain factors are changed appropriately.
- Which of the following are not optical and/or physical considerations of high plus lenses? A) increased weightB) increased thicknessC) increased lens aberrationsD) decreased FOVE) ring scotomaF) increased magnificationG) decreased ocular rotationsH) increased prismatic effect leading to convergence demands
- All of the following can increase a ring scotoma EXCEPT: A) decrease lens sizeB) increase lens power C) increase lens thicknessD) increase base curve
- A base to center prismatic effect generates a _______. It is a defect formed by last refracted ray to enter the lens and first unrefracted ray to tenter the eye from lens margin.
- All of the following are used to reduce magnification of a high hyperope lens. However, which one is not the best option because it can increase aberrations? A) thinner lens (decrease t) B) flattening front curve (decrease F1 = base curve) C) reduce vertex distance (decrease d)
- ________ is the linear distance between the far point and the near point of the eye.
- ______ are multiple rings seen just inside the edge of high minus lenses. It is caused by internal reflections and is noticeable to observer.
- What type of lens may cause a minified appearance of the eyes? A) high plus lensB) high minus lens
- Which of the following is NOT a concern for high minus lens wearers? A) weightB) thicknessC) minification (decreased retinal image size) D) ring of scotoma E) reflections of lens edges F) all the above are concerns
- Modified version of a myodisc and differs from myodisc via form of back surface of carrier (more curved).
- _______ is the Dioptric difference between the far point and the near point of the eye.
- The ______ is the outside area of little of no power in a lenticular lens. Lenticular allows for thickness and weight reduction.
- What am I describing? Cylinder on the front surface. Plano carrier. Aperture (bowl) is 30mm diameter.
- Which is worse for high myopes? A) nasal decentrationB) temporal decentration
- How can edge reflections be minimized? A) higher index material B) A/R coatingC) edge coatingD) polishing and rolling the edge E) all the above
- The retinal image size for a corrected axial or refractive myope is _______ compared to their uncorrected state.
- In a myodisc as lens power and/or aperture diameter increase -> carrier thickness ______.
- The ______ is the central area with prescribed lens power in a lenticular lens.