Steark Retinoscope Set With Case (Welchallyn) – NSL – 18342-VC

Steark Retinoscope Set is used to obtain an objective measurement of therefractive errorof a patient’seyes. The examiner uses aretinoscopeto shine light into the patient’s eye and observes the reflection (reflex) off the patient’sretina. While moving the streak or spot of light across the pupil the examiner observes the relative movement of the reflex or manually places lenses over the eye (using a trial frame and trial lenses) to “neutralize” the reflex.

静态检眼镜是一种视网膜检影法使用我n determining a patient’s refractive error. It relies onFoucault knife-edge test, which states that the examiner should simulateoptical infinityto obtain the correct refractive power. Hence, a power corresponding to the working distance is subtracted from the gross Retinoscope value to give the patient’srefractive condition, the working distance lens being one which has a focal length of the examiner’s distance from the patient (e.g. +1.50dioptrelens for a 67cmworking distance).Myopesdisplay an “against” reflex, which means that the direction of movement of light observed from the retina is a different direction to that in which the light beam is swept.Hyperopes, on the other hand, display a “with” movement, which means that the direction of movement of light observed from the retina is the same as that in which the light beam is swept.

Static Retinoscope is performed when the patient has relaxed accommodative status. This can be obtained by the patient viewing a distance target or by the use ofcycloplegic drugs(where, for example, a child’s lack of reliable fixation of the target can lead to fluctuations inaccommodationand thus the results obtained). Dynamic retinoscopy is performed when the patient has active accommodation from viewing a near target.

Retinoscope is particularly useful in prescribing corrective lenses for patients who are unable to undergo a subjective refraction that requires a judgement and response from the patient (such as children or those with severe intellectual disabilities or communication problems). In most tests however, it is used as a basis for further refinement by subjective refraction. It is also used to evaluateaccommodative abilityof the eye and detect latenthyperopia.