OPT-2375 Refractometry Unit 3 Flashcards
An example of an objective refraction is:
retinoscopy or autorefraction
T/F: Fogging or cyclopligics is commonly used to bring out latent hyperopia to manifest.
True
T/F: Pseudomyopia can be corrected using minus lenses.
False
A place where there is a high incidence of myopia is:
China
All of the following conditions require full correction of hyperopia except:
maximum acuity needed at distance
T/F: Of all of the refractive errors, myopia is the only one to show definite environmental factors on the incidence, distribution, degree and changes.
True
Hyperopia that is uncovered during a cycloplegic refraction and is added to the latent hyperopia is known as:
total
An astigmatic correction with its steepest power at 90 degrees is considered:
with the rule
The most common refractive error in the general population is:
astigmatism
A place where there is a low incidence of myopia is:
Africa
An astigmatic correction with its steepest power at 180 degrees is considered:
against the rule
T/F: Asthenopia is a symptom of an uncorrected refractive error.
True
Methods that have been used to control myopic progression include all of the following except:
base out prism
The most stable refractive error which rarely changes over time is:
Astigmatism
T/F: Pseudomyopia is a condition of on-going spasm of accommodation and required plus lenses to correct.
True
Accommodation that is uncovered during a normal non cycloplegic refraction is known as:
manifest
Accommodation not uncovered during a normal non cycloplegic refraction is known as:
latent
T/F: congenital myopia is normally acquired with excessive work on computers.
False
The refractive error that most likely has environmental contributing factors is:
myopia
T/F: Irregular astigmatism occurs when the principal meridians are 90 degrees apart at an oblique axis.
False
All of the following conditions require partial correction of hyperopia except:
esophoria
T/F: Total hyperopia plus latent hyperopia equal manifest hyperopia.
False
T/F: Excessive near work or computer use can lead to acquired myopia
True
