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used to search for magnified examination of the anterior segment of the eye (uniocular or binocular) Jackson's cross cylinder: used to check the power and axis of a cylindrical lens: Maddox rod: used to test for latent squint and retinal function Refraction box: has lenses of different powers for refraction testing: Slit lamp bio microscope
A trial frame is a tool used by ophthalmic professionals like ophthalmologists and optometrists. It is basically an adjustable spectacle frame with multiple cells, used to hold corrective lenses , and other accessories in subjective refraction (finding the correct spectacle power) and retinoscopy .
The Jackson cross cylinder (JCC) is an instrument used by ophthalmologists, orthoptists and optometrists in their routine eye examination, particularly in determination of corrective lens power in patients with astigmatism. It is also used for testing near point of the eye.
The grey scale is a graphical representation of the numerical display, allowing for easy interpretation of the field loss. Lower sensitivities are indicated by darker areas and higher sensitivities are represented with a lighter tone. [3] This scale is used to demonstrate vision changes to the patient but is not used for diagnostic purposes.
A pinhole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the ...
Dr. Michelle Holmes, OD, an optometrist at Pacific Neuroscience Institute. Dr. Craig See, MD , of Cleveland Clinic’s Cole Eye Institute Dr. Daniel C. Brocks, MD, the chief medical officer at ...