- Change exposed computed field's filter type to "Grouped filters",
- Widget type to "Radios",
- Check "Allow multiple selections" checkbox,
- Expose one option equal to 1 with your choice of label
See screenshot:


The view export:
<?php
$view = new view();
$view->name = 'computed_field_test';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'Computed Field Test';
$view->core = 7;
$view->api_version = '3.0';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = 'Computed Field Test';
$handler->display->display_options['use_more_always'] = FALSE;
$handler->display->display_options['access']['type'] = 'perm';
$handler->display->display_options['cache']['type'] = 'none';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['exposed_form']['options']['autosubmit'] = TRUE;
$handler->display->display_options['pager']['type'] = 'full';
$handler->display->display_options['pager']['options']['items_per_page'] = '10';
$handler->display->display_options['style_plugin'] = 'table';
/* Field: Content: Title */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['alter']['word_boundary'] = FALSE;
$handler->display->display_options['fields']['title']['alter']['ellipsis'] = FALSE;
/* Field: Content: List 1 */
$handler->display->display_options['fields']['field_list_1']['id'] = 'field_list_1';
$handler->display->display_options['fields']['field_list_1']['table'] = 'field_data_field_list_1';
$handler->display->display_options['fields']['field_list_1']['field'] = 'field_list_1';
/* Field: Content: List 2 */
$handler->display->display_options['fields']['field_list_2']['id'] = 'field_list_2';
$handler->display->display_options['fields']['field_list_2']['table'] = 'field_data_field_list_2';
$handler->display->display_options['fields']['field_list_2']['field'] = 'field_list_2';
/* Field: Content: Computed */
$handler->display->display_options['fields']['field_computed']['id'] = 'field_computed';
$handler->display->display_options['fields']['field_computed']['table'] = 'field_data_field_computed';
$handler->display->display_options['fields']['field_computed']['field'] = 'field_computed';
/* Sort criterion: Content: Post date */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
/* Filter criterion: Content: Published */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 1;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Content: Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
'page' => 'page',
);
/* Filter criterion: Content: Computed (field_computed) */
$handler->display->display_options['filters']['field_computed_value']['id'] = 'field_computed_value';
$handler->display->display_options['filters']['field_computed_value']['table'] = 'field_data_field_computed';
$handler->display->display_options['filters']['field_computed_value']['field'] = 'field_computed_value';
$handler->display->display_options['filters']['field_computed_value']['exposed'] = TRUE;
$handler->display->display_options['filters']['field_computed_value']['expose']['operator_id'] = 'field_computed_value_op';
$handler->display->display_options['filters']['field_computed_value']['expose']['label'] = 'Computed (field_computed)';
$handler->display->display_options['filters']['field_computed_value']['expose']['operator'] = 'field_computed_value_op';
$handler->display->display_options['filters']['field_computed_value']['expose']['identifier'] = 'field_computed_value';
$handler->display->display_options['filters']['field_computed_value']['expose']['multiple'] = TRUE;
$handler->display->display_options['filters']['field_computed_value']['is_grouped'] = TRUE;
$handler->display->display_options['filters']['field_computed_value']['group_info']['identifier'] = 'field_computed_value';
$handler->display->display_options['filters']['field_computed_value']['group_info']['optional'] = FALSE;
$handler->display->display_options['filters']['field_computed_value']['group_info']['widget'] = 'radios';
$handler->display->display_options['filters']['field_computed_value']['group_info']['multiple'] = TRUE;
$handler->display->display_options['filters']['field_computed_value']['group_info']['group_items'] = array(
1 => array(
'title' => 'Find all users where the Computed Field value is 1',
'operator' => '=',
'value' => array(
'value' => '1',
'min' => '',
'max' => '',
),
),
2 => array(
'title' => '',
'operator' => '=',
'value' => array(
'value' => '',
'min' => '',
'max' => '',
),
),
);
/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page');
$handler->display->display_options['path'] = 'computed-field-test';
$handler->display->display_options['menu']['type'] = 'normal';
$handler->display->display_options['menu']['title'] = 'Computed Field Test';
$handler->display->display_options['menu']['name'] = 'devel';