Net Retinoscopy Quiz and Flashcards for Mastery

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Questions and Answers

What is the purpose of retinoscopy?

To determine the patient's refractive error at distance (correct)

To assess the patient's color vision

To determine the patient's refractive error at near

To measure the patient's visual acuity

What is the role of working distance in retinoscopy?

It is important to maintain the working distance steady while performing retinoscopy (correct)

Working distance is only relevant for subjective refraction

Working distance does not affect the accuracy of retinoscopy

Varying working distance enhances the accuracy of retinoscopy

What is the starting point for subjective refraction?

Subjective refraction

Patient's visual acuity

Objective refraction/retinoscopy (correct)

Final spectacle prescription

What is the function of the optical head of a retinoscope?

Projects a slit beam of light called a 'streak' from one side of the head Signup and view all the answers

What does the concave mirror position in retinoscopy project?

A more defined streak of light Signup and view all the answers

In retinoscopy, what do the principal meridians correspond to?

Orientations that provide the thickest and thinnest reflexes Signup and view all the answers

What is the purpose of the break phenomenon in retinoscopy?

To determine the principal meridians in an astigmatic eye Signup and view all the answers

What is the main difference between with motion and against motion in retinoscopy?

The direction of reflex movement in relation to the streak Signup and view all the answers

What is the skiascopy technique used for in retinoscopy?

Neutralizing principal meridian movements Signup and view all the answers

When using an optical cross in retinoscopy, what is factored in when recording findings?

The working distance Signup and view all the answers

What does the gross retinoscopy represent?

The initial findings before adjusting for working distance Signup and view all the answers

What is the net retinoscopy in retinoscopy?

The final findings after adjusting for the working distance Signup and view all the answers

What is the role of the meridian in retinoscopy?

The line along which the streak of light is moved Signup and view all the answers

What does the plano mirror position in retinoscopy project?

A diffuse streak of light Signup and view all the answers

What does the skiascopy technique involve in retinoscopy?

Using a bar and a fixation target to neutralize principal meridian movements Signup and view all the answers

What is the procedure for retinoscopy?

Identifying the most plus meridian, neutralizing it first, then neutralizing the second meridian, and recording findings in minus sphero-cylinder form Signup and view all the answers

Study Notes

Retinoscopy: Key Points

The retinoscope uses a fixed bulb system and can create concave or plano mirror effects.
The concave mirror position projects a more defined streak of light, while the plano mirror position projects a diffuse streak.
The meridian in retinoscopy refers to the line along which the streak of light is moved, not the position of the streak.
Principal meridians correspond to orientations that provide the thickest and thinnest reflexes, varying in different refractive errors.
Break phenomenon is used to determine the principal meridians in an astigmatic eye, while the skew phenomenon involves the streak moving in one direction and the reflex in another.
Three types of retinoscopy reflex motions exist: with, against, and neutral, each requiring different lens adjustments for neutralization.
With motion reflex moves in the same direction as the streak, against motion moves in the opposite direction, and neutral motion remains constant as the streak moves across the pupil.
The skiascopy technique involves using a bar and a fixation target at distance 20/400 with R/G filter, in a dark room to neutralize principal meridian movements.
The procedure for retinoscopy involves identifying the most plus meridian, neutralizing it first, then neutralizing the second meridian, and recording findings in minus sphero-cylinder form.
An optical cross is used with loose lenses or skiascopy bars to neutralize both meridians, and the working distance is factored in when recording findings.
The gross retinoscopy is the initial findings, and the net retinoscopy is the final findings after adjusting for the working distance.
For example, if neutralizing +3.00 with motion at 180 and +2.00 against motion at 090, the gross retinoscopy would be +3.00-1.00x180, and the net retinoscopy would be +1.00-1.00x180.

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Description

Test your knowledge of retinoscopy with this quiz, covering key points such as retinoscope mirror effects, meridian movements, principal meridians, and neutralization techniques. Sharpen your understanding of retinoscopy reflex motions and learn about the skiascopy technique for determining refractive errors.