Volk is a company that produces these lenses, and such is the popularity of the manufacturer that fundus biomicroscopy lenses are now commonly referred to as 'Volk' lenses. It has the same magnification as the 90D, but its 116° dynamic FOV enables it to be an excellent diagnostic lens.

Similarly, it is asked, what is a Hruby lens?

The Hruby lens is a non-contact, plano-concave type negative lens with a power of -55D (some sources quote -58.6D).

Secondly, what is 20d lens? The main workhorse lens for use with the BIO is the 20D lens. This relatively low-powered lens (2.2D, 20D, Volk Optical; 20D Ocular Instruments; Diamond 20D Katena) is a compromise between magnification and field of view.

Also Know, how do you clean Volk lenses?

Volk University: Clean Up Your (Lens) Act

  1. rinse lens under warm running tap water.
  2. use a very soft, non-abrasive sponge, with a mild detergent, such as Dawn soap, to gently clean the lens surface.
  3. clean lens one side at a time in a clockwise direction.
  4. dry the lens with a low-lint cotton, or cotton-synthetic towel.

How do you master an indirect ophthalmoscopy?

Indirect Ophthalmoscopy 101

  1. Dilate properly. To conduct a good peripheral exam, the patient's eyes must be well dilated.
  2. Position the patient for optimal viewing.
  3. Choose the right lens.
  4. Minimize lens distortion.
  5. Adjust the indirect headset.
  6. Depress the sclera.
  7. Ask for help when you need it.

How do you examine the retina?

Always use your right eye to examine the patient's right eye and your left eye to examine the patient's left eye to avoid being nose to nose with the patient. Start by locating the red reflex, which is the reflection of light from the retina. Hold the viewing window of the ophthalmoscope directly in front of your eye.

What is a Gonio lens?

Gonioscopy is performed during the eye exam to evaluate the internal drainage system of the eye, also referred to as the anterior chamber angle. The "angle" is where the cornea and the iris meet. A special contact lens prism placed on the surface of the eye allows visualization of the angle and drainage system.

What is indirect ophthalmoscopy?

The binocular indirect ophthalmoscope, or indirect ophthalmoscope, is an optical instrument worn on the examiner's head, and sometimes attached to spectacles, that is used to inspect the fundus or back of the eye. It produces an stereoscopic image with between 2x and 5x magnification.

What part of the eye does a Fundoscopy examine?

Ophthalmoscopy, also called funduscopy, is a test that allows a health professional to see inside the fundus of the eye and other structures using an ophthalmoscope (or funduscope). It is done as part of an eye examination and may be done as part of a routine physical examination.

How do you use a direct ophthalmoscope?

Turn on the ophthalmoscope and set the light to the correct aperture. Dim the lights. Instruct the patient to focus on an object straight ahead on the wall. To exam the patient's RIGHT eye, hold the ophthalmoscope in your RIGHT hand and use your RIGHT eye to look through the instrument.

How do you disinfect a Gonioscopy lens?

Disinfection of gonioscopy lenses usually mirror tonometry guidelines, but also consider the manufacturer's instructions. The manufacturers of the Volk Gonioscopy lens recommend cleaning the entire lens using a mild cleaning solution (such as diluted dishwashing liquid) and a clean soft cotton cloth.

What is a bio in Optometry?

BIO is one of the ways used to view the retina, with a wide field of the retina and stereoscopic view. BIO also allows dynamic observation of the retina by moving the BIO device, lens, and applying scleral depression. The process is “indirect” because the fundus is viewed through a hand held condensing lens.

What are diagnostic lenses?

Diagnostic Lenses. These diagnostic lenses are all use in ophthalmology for viewing the posterior segment of the eye. Depending on which model you choose, lenses can be either contact or non-contact, and available in a variety of magnifications and view fields.

How much is a diopter?

A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.