Fan and Block
Fan and Block used to be a common method for correcting astigmatism but has been superseded by the cross cyl technique. It is however still a useful method especially when dealing with larger cyls and sometime patients finds the fan and block method less confusing. Its certainly a useful backup especially in situations where hi tech equipment is not available.
Видео Fan and Block канала Ian Squire
Видео Fan and Block канала Ian Squire
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