Welcome to WBCS Notebook, where you can ask questions and receive answers from other members of the community.
0 votes
13 views
in INDIAN ECONOMY by (300 points)

What is the use of auto refractometer?

Auto refractometer is used to determine an individual’s prescription by measuring how light is affected as it reflects through the eyeball. The process is quick and painless for the patient, and the data ensures a baseline to determine the correct eyeglass or contact lens prescription.

What is Autorefractor keratometer?

Autorefractor/keratometers (ARKs) are computerized devices that provide both refractive testing and keratometry measurements. This allows eyecare professionals to determine both a baseline for the patient’s prescription as well as the curvature of the cornea for contact lenses.

What is Autorefractometry?

INTRODUCTION S Refractometry is the estimation of refractive error with a machine, called refractometer or optometer. S Automated Refractometers (AutoRefractors) are designed to objectively determine the refractive error & are of various types depending upon the underlying principle they are based on.

How does a refractometer work?

Refractometers measure the degree to which the light changes direction, called the angle of refraction. A refractometer takes the refraction angles and correlates them to refractive index (nD) values that have been established. Measurements are read at the point where the prism and solution meet.

Chart Projector

The chart projector is an AC-powered device intended to project an image on a screen for vision testing.

Ophthalmic examination chart projector including a rotatable chart carrying disc and a mask plate which are co-axial with each other. A light source and a projecting lens assembly are provided for projecting one of the charts on the disc and one of the mask openings onto a screen. An index tube is rotatably mounted in the projecting optical path and carrying a colored filter on the inner periphery thereof. Thus, an astigmatic index can be projected on the peripheral portion of the astigmatic examination chart. The chart carrying disc, the mask plate and the astigmatic index tube can be controlled by knobs all provided on the front panel of the projector.

Handheld Autorefractors

There are important applications for a handheld autorefractor in the clinical setting. A portable but powerful handheld autorefractor such as the SVOne (Smart Vision Labs; Figure 1) can be used in place of a desktop unit if, for instance, the desktop unit malfunctions or needs servicing. The SVOne adds flexibility to the clinic because it is transportable. This can improve patient flow dynamics, taking the testing modality to the patient rather than having the patient leave the exam room to go to a testing station. A handheld autorefractor serves to relieve bottlenecks if a testing station is occupied; it also allows clinicians to carry the technology to satellite offices that may not have the same diagnostic equipment as the main office.

Where a handheld autorefractor such as the SVOne could have its greatest impact, however, is in teleophthalmology settings. In certain rural areas, there are coverage gaps where patients often have to travel great distances to be seen by an eye care provider. Using the SVOne, which is a Hartmann-Shack wavefront sensor affixed to an iPhone, it would not take much to design a protocol to remotely screen patients to detect refractive errors in need of follow-up.

Understanding and caring for a lensmeter

lensmeter or lensometer is an instrument used to verify the prescription of eyeglasses or spectacles. Many lensmeters can also verify the power of contact lenses with the addition of a special lens support. The values obtained from a lensmeter are the values specified on the patient's eyeglass prescription: sphere, cylinder, axis, add, and in some cases, prism. It is commonly used prior to an eye examination to obtain the last prescription the patient was given, in order to expedite the examination.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

Related questions

0 votes
0 answers 6 views
0 votes
0 answers 9 views
0 votes
0 answers 34 views
0 votes
0 answers 13 views
0 votes
0 answers 10 views
0 votes
0 answers 5 views
0 votes
0 answers 7 views
0 votes
0 answers 9 views
0 votes
0 answers 14 views
+1 vote
0 answers 16 views
0 votes
0 answers 25 views
0 votes
0 answers 13 views
0 votes
0 answers 30 views
0 votes
0 answers 21 views
0 votes
0 answers 21 views
0 votes
0 answers 11 views
0 votes
0 answers 33 views
0 votes
0 answers 19 views
0 votes
0 answers 11 views
0 votes
0 answers 12 views
0 votes
0 answers 11 views
0 votes
0 answers 35 views
0 votes
0 answers 10 views
0 votes
0 answers 16 views
0 votes
0 answers 26 views
0 votes
0 answers 13 views
+1 vote
0 answers 32 views
0 votes
0 answers 16 views
0 votes
0 answers 20 views
0 votes
0 answers 11 views
0 votes
0 answers 10 views
0 votes
0 answers 9 views
0 votes
0 answers 9 views
asked in INDIAN ECONOMY by bop13mo (300 points)
0 votes
0 answers 11 views
0 votes
0 answers 9 views
0 votes
0 answers 20 views
0 votes
0 answers 11 views
Welcome to WBCS Notebook, where you can ask questions and receive answers from other members of the community.

1.1k questions

59 answers

6 comments

284k users

...