lens, the condition of the eye and

spectacle used.

The package, from Longman Micro Software, is suitable for all biology students over the age of 11. However, users are expected to be familiar with the structure of the eye, the term focus and concave and convex lenses.

Eye begins with a labelled diagram of the eye and offers a choice of monochrome or colour display.

From here the program progresses through successive pages on lens thickness, iris diameter (in the first program only), object distance and spec tacle type (second program only).

When the user is satisfied, a beam of light is plotted to see if the image is in focus for the chosen set of conditions. The commands available are displayed throughout and a list of explanations of the com mands can be used.

The obvious use for such software is as a class demonstration or where individuals or small groups of pupils have access to it.

The teacher's notes provided are short, but pithy and useful. They cover loading and the use of the software on various hardware, objectives, required knowledge, the model used by the programs, using the programs - including some excellent illustrations of screen displays - and lastly sample exercises.

Overall I can givea resounding, Aye to Eye. It is excellent teaching material for both CSE and 'O' level students and at £14.50, is good value.

Peter Hillman