Refraction Outside The Phoropter

Question 1

Indications for trial fram refraction

Answer 1

• high refractive errors (including aphakes)
• low vision
• accommodative instability
• ambulatory restrictions
• institutional settings, such as nursing homes and hospitals
• uncooperative children

Question 2

Advantages of trial frame refraction over phoropter

Answer 2

• wider field of view
• allows for head turning/eccentric viewing
• large power changes easily incorporated
• easier to compare old to new Rx
• easy mouthing of low vision devices to trial frame

Question 3

Advantage of trial clip refraction

Answer 3

Can clip them onto spec rx. Faster

Question 4

Recording of alternative refraction techniques

Answer 4

• record technique
• final correction of OD and OS
• record VA

Question 5

Recommendations for performing efficient trial frame/clip refraction

Answer 5

• avoid changing the lenses in the cells of the trial frame
• insert lenses smoothly
• use proper increments to allow patient to notice difference
• can be done as quickly as phoropter

Question 6

For spectacle correction, what should you take into consideration?

Answer 6

• age
• degree of symptoms
• amount of ametropia
• VA
• bino function
• efficiency during the performance of visual tasks
• presence of astigmatism or anisometropia
• previous Rx-and how long has the patient has this rx