What is scissoring reflex on retinoscopy?
For a scissoring reflex, which occurs in keratoconus, observe the central area of the reflex. If the reflex is poor or irregular, then alternate methods should be used, such as a contact lens overrefraction or stenopeic slit refraction.
What is Cycloplegic refraction?
Cycloplegic refraction is a procedure used to determine a person’s complete refractive error by temporarily relaxing the muscles that aid in focusing the eye. Cycloplegic eye drops are used to temporarily relax the ciliary body, or focusing muscle, of the eyes.
What is a Cycloplegic?
Specialty. Ophthalmology. Cycloplegia is paralysis of the ciliary muscle of the eye, resulting in a loss of accommodation. Because of the paralysis of the ciliary muscle, the curvature of the lens can no longer be adjusted to focus on nearby objects.
How do you perform a Cycloplegic refraction?
Performing cycloplegic refraction
- Direct the patient to look at a distance target (duochrome) with both eyes open.
- Due to pupil dilation and peripheral aberrations, the retinal reflexes may be distorted.
- Determine the spherical/cylindrical error in the right eye first.
- Repeat the procedure for the other eye.
Is phoropter accurate?
Phoropter values were measured in 0.25 diopter steps, while VASR data was refine-able to the nearest 0.01 diopters. The results revealed that there was no statistically significant difference from the mean in equivalent sphere measurements (P = 0.1383) between Vmax VASR and the phoropter.
Why is it called a phoropter?
The phoropter was unique from the device that was previously being used, the monocular optometer, because the phoropter was able to measure refractive errors as well as traits of binocular vision (meaning how well the eyes work together), among other things.
How are the reflex motions determined in retinoscopy?
Reflex motions in retinoscopy. Starting with the right eye, shine the retinoscopy streak into the patient’s eye and move it from side to side. Determine if the light reflex in the patient’s pupil moves “with” or “against” motion (Figure 2). Rotate the axis of the streak and look at the reflex in different meridians.
What do you need to know about retinoscopy?
Reflex motions in retinoscopy. Starting with the right eye, shine the retinoscopy streak into the patient’s eye and move it from side to side. Determine if the light reflex in the patient’s pupil moves “with” or “against” motion (Figure 2).
What is the working distance between the retinoscope and the phoropter?
For example, if the working distance between your retinoscope and the phoropter is 50cm, then subtract 1/0.5m or 2.00 diopters from the final spherical correction to account for this. Figure 2. Reflex motions in retinoscopy. Starting with the right eye, shine the retinoscopy streak into the patient’s eye and move it from side to side.
Who is the author of the retinoscopy book?
About the author: Olivia L. Lee, MD, is a specialist in uveitis and cornea/external disease at the Doheny Eye Institute and Assistant Professor of Ophthalmology at UCLA.