HEINE LAMBDA 100 RETINOMETER

Heine Lambda 100 Retinometer

Heine Lambda 100 Retinometer

Introduction

The LAMBDA 100 Retinometer is considered to be the first compact instrument for assessing potential visual acuity of patients with cataracts and other opacities. LAMBDA 100 - clinically tested with excellent results. It is simple, easy-to-use controls. Reliable diagnosis, easy to operate.

The instrument fits onto battery- or rechargeable handles. Complete mobility - no dependence on the slit lamp.

Compact, lightweight (100 g). Can be used anywhere - even bedside.

XHL Xenon Halogen Technology and brightness control. Avoids patients discomfort from dazzle.

Safety information

Range of applications: The Heine Lambda 100 retinometer is only used to test the visual acuity of the eye. Safety in use: Use only power sources which are designed for use in medical applications. Please note: The performance of this instrument can only be guaranteed if genuine Heine rechargeable batteries or alkali manganese batteries are used.

Working

The Heine Lambda 100 works on the principle of the Maxwellian view: A micro-aperture is illuminated by a halogen bulb through a red filter and imaged by an optical system into the patient pupil. The optical system consists basically of two lenses between which optical grids with variable spacing can be positioned in the parallel beam which passes through them. The resulting diffraction forms a circular test pattern with equally-spaced red and black lines on the retina. The distance between the lines corresponds to that of the Snellen E (Visus 1 = 33 lines / degree of visual angle). The orientation of the lines can be selected by means of a prism in 45º steps. Because the beam in the pupillary plane is very narrow (a few tenths of a mm), a tiny “window” in the opacity of the lens is enough to allow the light to pass through for a successful examination (Orr, 2008). ...