The blue field entoptic phenomenon or Scheerer's phenomenon

Entoptic Phenomenon Notes

Entoptic Phenomenon Definition: are visual effects whose source is within the eye itself. (Occasionally, these are called entopic phenomena, which is probably a


Retinoscope and Retinoscopy Notes

Retinoscope  Definition: A retinoscope is an instrument used to objectively determine the refractive power of the eye. It works by allowing


Focimeter (Lensmeter) Notes

Focimeter Definition: An ophthalmic instrument. It is mainly used by optometrists and opticiansto verify the correct prescription in a pair of eyeglasses, to properly orient and


Synoptophore Notes

Synoptophore Definition: This is an Ophthalmic Instrument, used for diagnosing imbalance of eye muscles and treating them by orthoptic methods.

Haidinger's brush

Haidinger’s brush Notes

Haidinger’s brush appears on computer screens and blank areas of sky, and it’s caused by the way our eyes respond to