Essential information written by Key Stage 3 SATs, GCSE and AS Level examiners, presented as bullet points and concise notes with key points highlighted to aid revision. Covers all the topics needed for every syllabus and written especially for 2001 exams. The notes include examiners tips to ensure important information is highlighted, and less formal student tips offering suggestions on where extra marks can be gained. Letts revision notes help condense course content into the essential points but also offer exam practice and each topic is followed by a short test so that students can monitor their progress. The books also have internet support available from Letts website. For every topic there is available a topic test on the website that allows students extended practice in examination style questions.
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The Riester ri-vision with Slit Retinscope is a kit of the ri-scope retinoscope with silt lamp and the riester ophthalmoscope L2. Included with this kit are two fixation cards for dynamic retinoscopy and two spare lamps. The battery handle is a Type C with rheostat for 2 Li batteries and uses the XL 3.5 V lamp. The ri-scope retinoscope (skiascope) measures the refractive power of the eye. Refractive flaws, such as near- and far-sightedness, as well as astigmatism can be detected and diagnosed. The slit-light retinoscope with a light beam in the form of a line, simplifies detection and diagnosis of astigmatic refractive flaws. The reflex in the form of a line is moved vertically to the axis across the pupils of the patient with a slight oscillating movement. A shadow moves in the same or opposite direction. Co-movement (plus lines): The patient is far-sighted. Countermovement (minus lines): The patient is nearsighted. All ri-scope L ophthalmoscopes with modular design impress with their high-performance optics with aspherical condenser lens with reduced-reflection view even with small pupils and through improved ergonomics. The ri-scope L2 is the enhanced basic model with separately engageable red-free, blue and polarization filters for each aperture.
Measures the refractive power of the eye; Recognizes errors of refraction and astigmatism
Simple operation with knurled thumb screw
Holder for hanging and fixing the fixation card into position for dynamic retinoscopy; Integrated eyeglass protection
Integrated eyeglass protection; Battery handle, type C with rheostat