19thC EARLY OPHTHALMOSCOPE museum piece ANTIQUE OPTHAMOLIST TOOL

$145.00
Posted over a month ago
Saint George, ON N0E1N0(View Map)
  • More Info
    Vintage, Antiques

Description

19thC EARLY OPHTHALMOSCOPE museum piece ANTIQUE OPTHAMOLIST MEDICAL TOOL

… nice old collectable medical instrument … ideal gift – perfect for doctor’s office display case ...

• a very primitive 1800s medical tool

• six-sided hexagon metal handle - handle shows normal age related black paint loss - handle measures: 4 ¼”L

• removable mirror - screw into handle as shown • mirror has centre hole for examining patient’s eye - mirror diameter: 1 ¼” - primitive mirror shows signs of age as shown - free of cracks

• maker / origin unknown (possibly, S. Maw & Son ? – London) • $145.00 – shipping available

SIDE NOTE: This ophthalmoscope was used with a condensing lens (usually a lens of +13.00 to +20.00 diopters of power) to view the back of the eye

The light source Would have been a candle or gas lamp and would reflect off the mirror into the patient’s pupil to illuminate the interior of the eye

It was later discovered that when the mirror was moved, the light would move within the eye to produce a sort of shadow effect.

Depending on the person’s refractive error, this movement could be neutralized using various powered lenses placed in the path of the light

This was how retinoscopy was discovered. So, this same type of simple ophthalmoscope also served as the earliest retinoscope

This archaic instrument continued to be used well into the early twentieth century (1900’s)

MD122 PLEASE, CHECK YOUR SPAM / TRASH FOR REPLIES as SOMETIMES THE RELPIES END UP IN THE SPAM / TRASH BOX

** pls. view poster’s other ads: NOT the USUAL SORT OF STUFF - SPECIALTY & RARE, odd & quirky, eclectic, interesting & unique; a number of children’s, classics, rare & first edition books; original fine art, Victorian mourning stuff, Native Indian, toys, military, bronzes, Asian, antique Masonic / Freemason & Odd Fellows, home décor, man cave, prints, signs, smokerama, retro, Art Deco, primitives

7.5 x 3.75 x 3.75 .8 lbs

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