Retinoscopy; for Ophthalmologists and Optometry students

Demonstrates retinoscopy using spherical lenses and then with spherical plus cylindrical lenses, identifies principal meridians, neutralizes with streak orientation, and records results on a power cross.

Learn static retinoscopy neutralization using spherical and cylindrical lenses, including axis alignment and final plus 1.5 spheres minus 2 cylinder at 180 degree with working distance compensation.

Compare spherical lenses only and spherical-plus-cylindrical methods in retinoscopy, noting that both yield the same results while each offers advantages for infants or adults, and detailing practical challenges.

Sweep four meridians to gauge refractive state. Sweep the second eye for accommodation cues, identify and neutralize the two principal meridians, compute sphero cylinder refraction, and compensate for working distance.

Identify the two principal meridians in eyes with regular astigmatism by sweeping retinoscopy light in vertical, horizontal, and oblique directions, to assess refractive state and cylinder axis.

Observe the break phenomenon: reflex misalignment with the light indicates astigmatism and axis; rotate the sleeve to align the light and identify two 90 and 180 meridians, then continue refraction.

Neutralize each meridian with sphere lenses, then use sphere or sphere with cylinder for refraction while keeping the light streak at 90 degrees; rotate the meridian axis by ±90 degrees.

Assess how walking distance affects retinoscopy reflex, using 66 cm as distance. Subtract 1.5 diopters from spherical power to compensate, noting brighter reflexes but higher error risk at close distances.

Use the sphere lenses method in retinoscopy to neutralize reflex motion across horizontal and vertical meridians, progressing from +1 to +3.5 D, confirming no astigmatism, and applying working-distance correction.

Demonstrates the sphere lenses method in retinoscopy, guiding neutralization across meridians using minus and plus lenses, adjusting for motion, axes, and walking distance to derive final refraction.

Demonstrates a sphere plus cylinder retinoscopy method, neutralizing horizontal and vertical meridians with sphere then cylinder lenses, aligning axis at 90 degrees, and confirming final refraction at the working distance.

Practice using a model eye with artificial training guide: set minus four sphere, then add cylinder with trial lenses to obtain minus four sphere plus 2.75 cylinder at axis 60.

In Pareek phenomenon, reflex orientation does not reliably indicate cylinder axes; keep rotating until alignment, as meridians and neutral point distance influence the reflex and observed orientation.